DISPLAY DEVICE Technical Field [1] The present invention relates to a display device, and more particularly to a display device that allows both stacking and hanging of products for display. Background Art [2] A variety of different types of display devices are used to display products in exhibition halls, department stores, etc. Such display devices are designed to optimally attract the attention of potential customers. [3] The two main types of display devices include the shelf-type display device in which products are stacked on a display shelf, and the hanger-type display device in which products are hung on a separate hanging apparatus. [4] These display devices provide for only a single function. That is, with the use of the shelf-type display device, it is not possible to hang products, and similarly, the hanger- type display device does not permit the stacking of products to exhibit the same. Further, although conventional display devices can perform their intended function, they are made with only minimal aesthetic considerations. Disclosure of Invention Technical Problem [5] In one exemplary embodiment of the present invention, there is provided a display device that permits both a shelf configuration and a hanging structure, and that is made with an improved appearance. Technical Solution [6] A display device includes a frame, a hanger support mounted extending on the frame, and at least one first catch member provided in the hanger support forming a hooking structure. [7] The frame includes a horizontal frame section mounted extending horizontally on the ground, and vertical frame sections mounted extending vertically from opposite end portions of the horizontal frame section. [8] The horizontal frame section includes a wheel mounted on a bottom surface thereof. [9] In an alternative embodiment, the frame includes at least a pair of vertical frame sections that may be mounted to a wall, and at least a pair of protruding frame sections mounted respectively to the vertical frame sections extending outwardly from the vertical frame sections. The frame further includes an interconnecting frame section extending from one of the vertical frame sections to a front portion of a corresponding one of the protruding frame sections. [10] The hanger support may be formed as a board- shaped hanger support. A plurality of the first catch members are formed on a bottom surface of the board- shaped hanger support, the first catch members extending along a direction of a width of the board- shaped hanger support, with adjacent ones of the first catch members being spaced apart at a predetermined distance. [11] Alternatively, the hanger support is formed as a bar-shaped hanger support. A plurality of the first catch members are formed in a front surface of the bar-shaped hanger support along a height of the bar-shaped hanger support, as well as in a front- to-rear direction of the bar-shaped hanger support, adjacent ones of the first catch members being spaced apart at a predetermined distance. [12] Preferably, the display device includes a second catch member formed to enable hanging on the hooking structure of the first catch member. [13] The first catch members may respectively include magnets mounted therein. [14] In another embodiment, the first catch members of the bar-shaped hanger support respectively include vertical grooves that extend along a direction of the height of the bar-shaped hanger support, and a horizontal groove extended along a length of the bar- shaped hanger support intersecting the vertical grooves. The horizontal groove is formed more deeply into the bar-shaped hanger support than the vertical grooves. [15] In another embodiment, the first catch members of the bar-shaped hanger support include vertical grooves formed along a direction of the height of the bar-shaped hanger support, and front-to-rear grooves formed extending in a front-to-rear direction at locations corresponding to the vertical grooves, the vertical grooves extending a pre¬ determined distance starting from the bottom of the bar-shaped hanger support, and the front-to-rear grooves being formed at top ends of the vertical grooves. The vertical grooves may be provided in one of the configurations of being formed in one of extending through the entire width of the bar-shaped hanger support, and extending a predetermined distance into the bar-shaped hanger support starting from the front surface of the bar-shaped hanger support. [16] The bar-shaped hanger support may have a cylindrical, quadrilateral, or triangular cross section. [17] The second catch members may be spherical, multilateral, or cylindrical in shape. [18] In another embodiment, reinforcing members are mounted respectively in the first catch members of the board-shaped hanger support. The reinforcing members have a downward and front-to-rear open structure. The reinforcing members extend across one of the entire width of the board-shaped hanger support and part of the width of the board- shaped hanger support on one side of the board- shaped hanger support. Magnets are respectively mounted in one end of the reinforcing members. [19] In another embodiment, reinforcing members are mounted respectively in the first catch members of the bar-shaped hanger support. The reinforcing members have a forward and upper, lower open structure. A magnet is mounted in one end of each of the reinforcing members. Alternatively, the reinforcing members have an upper, lower open structure corresponding to the portion of the first catch members formed along the height of the bar-shaped hanger support, and a front open structure corresponding to the front-to-rear portion of the first catch member. [20] In another embodiment, the first catch members of the bar-shaped hanger support respectively include vertical grooves that extend along a direction of the height of the bar-shaped hanger support, and a horizontal groove extended along a length of the bar- shaped hanger support intersecting the vertical grooves and formed in a stepped con¬ figuration. [21] A cover may be mounted to the board-shaped hanger support and the bar-shaped hanger support such that the first catch members may be selectively concealed and accessed. Magnets may mounted respectively on opposing surfaces of the cover and the board-shaped hanger support or the bar-shaped hanger support. [22] In another embodiment, the first catch members of the bar-shaped hanger support include vertical grooves formed within a front face of the bar-shaped hanger support along a direction of a height of the bar-shaped hanger support, insertion grooves formed rearwardly from the vertical grooves along the direction of the height of the bar-shaped hanger support and with greater dimensions than the vertical grooves, and center grooves formed under the insertion grooves in spatial communication with the vertical grooves and extending approximately to a center of the insertion grooves. The insertion grooves are formed above, or above and below the center grooves. Advantageous Effects [23] In the display device of the present invention described above, the first catch members 50 are provided as hooking structures on the board-shaped hanger support 32 and/or the bar-shaped hanger support 34. The second catch members 70 are able to hang on the hooking structures of the first catch members 50. Such a structure allows for the hanging of products, or in some embodiments, both the hanging and stacking of products for display thereof. Further, by forming the first catch members 50 to only one side of the hanger supports 32, 34, an organized and overall attractive appearance from the opposite side of the display device is realized. [24] Further, the cover 80 is able to selectively conceal the first catch members 50 of the hanger supports 32, 34 such that disconnection of the second catch members 70 from the first catch members 50 is prevented, and the outer appearance of the display device is enhanced. [25] In addition, the mounting of the reinforcing members 50a in the first catch members 50 prevents damage to the first catch members 50. [26] Finally, by the formation of the first catch members 50 including the vertical grooves 54, the insertion grooves 55, and the center grooves 57, the second catch members 70 are securely positioned within the first catch members 50 to thereby prevent inadvertent detachment of the second catch members 70. Brief Description of the Drawings [27] The accompanying drawings, which together with the specification, illustrate exemplary embodiments of the present invention, and, together with the description, serve to explain the principles of the present invention. [28] Fig. 1 is a perspective view of a display device according to an exemplary embodiment of the present invention. [29] Fig. 2 is a side view of the display device of Fig. 1. [30] Fig. 3 is a rear view of the display device of Fig. 1. [31] Fig. 4 is a partial bottom view of a board-shaped hanger support according to a first exemplary embodiment of the present invention. [32] Fig. 5 shows a modified example of the board-shaped hanger support of Fig. 4. [33] Fig. 6 is a partial bottom view of a board-shaped hanger support according to a second exemplary embodiment of the present invention. [34] Fig. 7 shows a modified example of the board-shaped hanger support of Fig. 6. [35] Figs. 8 and 9 are respectively front and rear perspective views of a reinforcing member of Fig. 7. [36] Fig. 10 is a partial perspective view of a bar-shaped hanger support according to a first exemplary embodiment of the present invention. [37] Fig. 11 shows a modified example of the bar-shaped hanger support of Fig. 10. [38] Figs. 12 and 13 are respectively front and rear perspective views of a reinforcing member of Fig. 11. [39] Fig. 14 is a perspective view of a bar-shaped hanger support according to a second exemplary embodiment of the present invention. [40] Fig. 15 shows a modified example of the bar-shaped hanger support of Fig. 14. [41] Fig. 16 is a partial perspective view of a reinforcing member of Fig. 15. [42] Fig. 17 shows another modified example of the bar-shaped hanger support of Fig. 14. [43] Fig. 18 is a perspective view of a bar-shaped hanger support according to a third exemplary embodiment of the present invention. [44] Fig. 19 shows a modified example of the bar-shaped hanger support of Fig. 18. [45] Fig. 20 is a perspective view of a bar-shaped hanger support according to a fourth exemplary embodiment of the present invention. [46] Fig. 21 shows a modified example of the bar-shaped hanger support of Fig. 20. [47] Figs. 22-26 show perspective views of catch members of hanging devices re¬ spectively according to first through fifth exemplary embodiments of the present invention. [48] Fig. 27 is a perspective view of a display device according to a second exemplary embodiment of the present invention. [49] Fig. 28 is a perspective view of a display device according to a third exemplary embodiment of the present invention. [50] Fig. 29 is a perspective view of a display device according to a fourth exemplary embodiment of the present invention. [51] Fig. 30 is a sectional view taken along line A-A of Fig. 29. [52] Fig. 31 is a perspective view of a display device according to a fifth exemplary embodiment of the present invention. [53] Fig. 32 is a perspective view of a bar-shaped hanger support according to a fifth exemplary embodiment of the present invention. [54] Fig. 33 is a partial perspective view of a reinforcing member of Fig. 32. [55] Fig. 34 shows a modified example of the bar-shaped hanger support of Fig. 32. [56] Fig. 35 is a perspective view of a bar-shaped hanger support according to a sixth exemplary embodiment of the present invention. [57] Fig. 36 is a partial perspective view of a reinforcing member of Fig. 35. [58] Fig. 37 is a sectional view taken along line B-B of Fig. 35. Best Mode for Carrying Out the Invention [59] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. [60] Fig. 1 is a perspective view of a display device according to an exemplary embodiment of the present invention, Fig. 2 is a side view of the display device of Fig. 1, and Fig. 3 is a partial bottom view of the display device of Fig. 1. [61] With reference to the drawings, the display device includes a frame 10, a hanger support 30, and first catch members 50. To enable optimal use, the display device preferably further includes second catch members 70. [62] The frame 10 forms the basic exterior of the display device and may be formed to various configurations as desired (e.g., to suit the particular location at which the display device is placed). The hanger support 30 is provided at a suitable height such that clothes hangers, tie hangers, or various other hangers may be used with the hanger support 30 without the clothes or other products hung thereon reaching the ground or a lower portion of the frame 10. [63] In the exemplary embodiment shown in Figs. 1-3, the frame 10 includes a horizontal frame section 12 and vertical frame sections 14. The horizontal frame section 12 is board-shaped and extends horizontally with respect to the ground. The vertical frame sections 14 are board-shaped and extend vertically from opposite end portions of the horizontal frame section 12. The horizontal frame section 12 and the vertical frame sections 14 may also be bar-shaped. Preferably, wheels 90 are mounted to a bottom side of the horizontal frame section 12 to allow for easy movement of the display device. This is particularly useful when the display device is made heavy by the hanging of many clothes thereon. Further, the frame 10 may be formed by only the vertical frame sections 14 with the omission of the horizontal frame section 12 if a structure is used to provide sufficient stability to the frame 10. In this case, the wheels 90 are preferably mounted to a lower end of the vertical frame sections 14. [64] The hanger support 30 is mounted extending across the frame 10. Preferably, the hanger support 30 is formed so that it may correspond to various different con¬ figurations of the frame 10. Further, the hanger support 30 may be horizontally mounted such that it is substantially parallel to the ground and/or the horizontal frame section 12, or may be mounted at an angle. In the case where the hanger support 30 is mounted at an angle, the first catch members 50 formed in the hanger support 30 preferably have a structure that allows for smooth engagement with the second catch members 70. [65] The hanger support 30 of the exemplary embodiment includes a board-shaped hanger support 32 and a bar-shaped hanger support 34. Only one of either the board- shaped hanger support 32 and the bar-shaped hanger support 34 may be used, or both may be used together as shown in Figs. 1-3. That is, in this exemplary embodiment, the board-shaped hanger support 32 is mounted to an upper end of the frame 10, and the bar-shaped hanger support 34 is provided under the board-shaped hanger support 32 extending along a center portion thereof. [66] The first catch members 50 are formed corresponding to the shape of the hanger support 30. Further, one or more of the first catch members 50 may be formed on side surfaces of the hanger support 30. In the drawings, one of the first catch members 50 is formed in each of the side surfaces of the hanger support 30 (only one is shown). [67] Each of the first catch members 50 is formed along a width of the board-shaped hanger support 32, and a plurality of the first catch members 50 is formed along a length of the board-shaped hanger support 32 with a predetermined distance provided between adjacent first catch members 50. This distance between adjacent first catch members 50 is preferably set corresponding to a thickness of a product to be hung on the first catch members 50. The first catch members 50 may also be used by skipping a predetermined number of the same as needed to suit the thickness of the particular product(s) hung on the first catch members 50. [68] Fig. 4 is a partial bottom view of a board-shaped hanger support 32 according to a first exemplary embodiment of the present invention. [69] In this embodiment, first catch members 50 extend across the entire width of the board-shaped hanger support 32. As a result, the first catch members 50 may be used from either a front side or a rear side of the board-shaped hanger support 32. That is, the first catch members 50 are formed to allow for insertion and supporting of second catch members 70 (see Fig. 1) therein, and the insertion of the second catch members 70 may be performed from either the front or the rear side of the board-shaped hanger support 32. Supporting of the second catch members 70 in the first catch members 50 is such that the second catch members 70 can not be removed by movement or ma¬ nipulation of the same upwardly or downwardly. [70] In the case where connecting members 72 (see, for example, Fig. 10), which are re¬ spectively coupled to the second catch members 70, are linearly formed, the first catch members 50 are preferably configured with openings that extend vertically downward. Further, if the board-shaped hanger support 32 is mounted at an angle, the second catch members 70 having the linearly formed connecting members 72 are formed at an angle that corresponds to that of the board-shaped hanger support 32 so that the second catch members 70 may be stably supported. In this case, the openings of the first catch members 50 are vertically formed as when the board-shaped hanger support 32 is hor¬ izontally mounted. [71] Fig. 5 shows a modified example of the board-shaped hanger support 32 of Fig. 4. In the modified example, each of the first catch members 50 further includes a re¬ inforcing member 50a. The reinforcing members 50a are made of a material that is stronger than that used for the first catch members 50. For example, the reinforcing members 50a are made of a metal material, preferably one that does not rust such as stainless steel or an aluminum alloy. The reinforcing members 50a prevent damage to the first catch members 50 as a result of loads transmitted through the connecting members 72 and the second catch members 70. Preferably, the reinforcing members 50a, as with the first catch members 50, are formed with an open structure that extends downwardly, as well as forwardly and rearwardly. The forward and rearward open structure allows for insertion of the second catch members 70, and the downward open structure allows for insertion of and sliding movement within the reinforcing members 50a by the connecting members 72. In the case where the board-shaped hanger support 32 is made of a wood material, the reinforcing members 50a may be inserted into the first catch members 50, while if the board-shaped hanger support 32 is made of a plastic material, the reinforcing members 50a may be mounted in the first catch members 50 using an insert formation method. [72] Fig. 6 is a partial bottom view of a board-shaped hanger support 32 according to a second exemplary embodiment of the present invention. [73] Aspects of first catch members 50 that are identical or similar to those of the first exemplary embodiment will not be described in the following, and only the differences therebetween will be pointed out and described in detail. [74] The first catch members 50 according to the second exemplary embodiment do not extend across the entire width of the board-shaped hanger support 32 as in the first exemplary embodiment. Instead, the first catch members 50 are formed into both sides of the board-shaped hanger support 32 extending a predetermined distance toward the opposite side in a direction along the width of the board-shaped hanger support 32. Al¬ ternatively, the first catch members 50 may be formed only into one side of the board- shaped hanger support 32. In this embodiment, magnets 52 are respectively provided in the first catch members 50. The magnets 52 ensure that second catch members 70 (see Fig. 1) are firmly held in place in the first catch members 50. Such a configuration may be required in consideration of the relatively short length of the first catch members 50 in this embodiment. [75] Fig. 7 shows a modified example of the board-shaped hanger support 32 of Fig. 6. In the modified example, each of the first catch members 50 further includes a re¬ inforcing member 50a. Since the first catch members 50 do not extend across the entire width of the board-shaped hanger support 32 but instead are formed separately on both sides of the board-shaped hanger support 32 as described above, the reinforcing members 50a likewise are formed separately on both sides of the board-shaped hanger support 32. The material and formation method of the reinforcing members 50a are identical to those of the reinforcing members 50a described with reference to Fig. 5. [76] Figs. 8 and 9 are respectively front and rear perspective views of one of the re¬ inforcing members 50a of Fig. 7. The reinforcing member 50a is inserted into a respective one of the first catch members 50, and may be formed having open front, rear, and bottom ends. As shown in Fig. 9, the magnet 52 may be provided to the rear of the reinforcing member 50a. The magnet 52 may be inserted into the corresponding first catch member 50 separately from the reinforcing member 50a, or mounted within the reinforcing member 50a as shown in Fig. 9 such that the magnet 52 is provided in the first catch member 50 by mounting of the reinforcing member 50a therein. The re¬ inforcing member 50a increases the strength of the corresponding first catch member 50, and the magnet 52 allows for better securing of the metal second catch member 70 in the reinforcing member 50a. [77] In the display device applying the board-shaped hanger support 32 as described above, with reference to Fig. 3, since the first and second catch members 50, 70 are not visible from a rear of the display device, a more attractive and neat overall appearance is realized. [78] The bar-shaped hanger support 34 is similar to the board-shaped hanger support 32. The bar-shaped hanger support 34 includes a plurality of first catch members 50 extended along a height of the bar-shaped hanger support 34. Adjacent first catch members 50 are provided with a predetermined distance therebetween. The distance between adjacent first catch members 50 is preferably set corresponding to a thickness of a product to be hung on the first catch members 50. The first catch members 50 may also be used by skipping a predetermined number of the same as needed to suit the thickness of the particular product(s) hung on the first catch members 50. When the distance between the adjacent first catch members 50 is fixed, the display device may be used specifically for a particular product having a set width. [79] Fig. 10 is a partial perspective view of a bar-shaped hanger support 34 according to a first exemplary embodiment of the present invention. [80] With reference to Fig. 10, first catch members 50 respectively include vertical grooves 54 formed along a direction of the height of the bar-shaped hanger support 34, and a front-to-rear groove 56 formed extending into the bar-shaped hanger support 34 along a front-to-rear direction thereof. The vertical grooves 54 are formed along the entire width of the bar-shaped hanger support 34, that is, along its entire height, the end result of which is that the bar-shaped hanger support 34 has no upper and lower end, thereby simplifying assembly. The vertical grooves 54 form a structure such that connecting members 72 coupled to second catch members 70 (and hence, hanging devices 20) are stably positioned in a state where the second catch members 70 are hung in the first catch members 50. Further, the front-to-rear grooves 56 are formed having a greater diameter than the vertical grooves 54 so that a hooking structure is formed between the vertical grooves 54 and the front-to-rear grooves 56. When magnets 52 are provided in the front-to-rear grooves 56, the advantages as discussed above in relation to the board-shaped hanger support 32 are realized. [81] Fig. 11 shows a modified example of the bar-shaped hanger support 34 of Fig. 10. In the modified example, reinforcing members 50a are formed in the first catch members 50, the function and advantages of which are identical to those described above. [82] Figs. 12 and 13 are respectively front and rear perspective views of one of the re¬ inforcing members 50a of Fig. 11. The reinforcing member 50a is inserted in one of the first catch members 50, and may be formed with an open front end 56a, as well as upper and lower notches 54a. As shown in Fig. 13, one of the magnets 52 may be provided to the rear of the reinforcing member 50a. Hence, with the positioning of the reinforcing member 50a in one of the first catch members 50 (see Fig. 11), the re¬ inforcing member 50 has an open upper and lower structure with respect to the cor¬ responding vertical groove 54, and a structure that is open on one side with respect to the corresponding front-to-rear groove 56. [83] The open upper and lower structure of the reinforcing members 50a maintains the open formation of the vertical grooves 54 such that the bar-shaped hanger support 34 has no upper and lower end as discussed with reference to Fig. 10. Also, the formation of the vertical grooves 54 is maintained, in which the connecting members 72 coupled to the second catch members 70 (and hence, the hanging devices 20) are stably positioned in a state where the second catch members 70 are hung in the first catch members 50. [84] The magnet 52 may be inserted into the corresponding first catch member 50 separately from the reinforcing member 50a, or mounted within the reinforcing member 50a as shown in Fig. 13 such that the magnet 52 is provided in the first catch member 50 by mounting of the reinforcing member 50a therein. The reinforcing member 50a increases the strength of the corresponding first catch member 50, and the magnet 52 allows for better securing of the metal second catch member 70 in the re¬ inforcing member 50a. [85] Fig. 14 is a perspective view of a bar-shaped hanger support 34 according to a second exemplary embodiment of the present invention. [86] First catch members 50 according to the second exemplary embodiment include vertical grooves 54 that extend along a direction of the height of the bar-shaped hanger support 34, as well as a horizontal groove 58 extended along the length of the bar- shaped hanger support 34 intersecting the vertical grooves 54. The vertical grooves 54 are identical to those of the first exemplary embodiment. The horizontal groove 58 forms hooking structures where intersecting the vertical grooves 54 such that the horizontal groove 58 functions as the front-to-rear grooves 56 in the first exemplary embodiment. To realize a stabilizing effect, the horizontal groove 58 is preferably formed to a greater depth than the vertical grooves 54. With this structure, second catch members 70 are supported in the first catch members 50 by three surfaces formed by the horizontal groove 58, that is, two surfaces formed on left and right sides of the second catch members 70, and one surface formed to the rear of the second catch members 70. [87] Fig. 15 shows a modified example of the bar-shaped hanger support 34 of Fig. 14. In the modified example, the first catch members 50 further include a reinforcing member 50a, which is formed in the horizontal groove 58. [88] Fig. 16 shows a partial perspective view of the reinforcing member 50a of Fig. 15. The reinforcing member 50a is inserted in the horizontal groove 58, and includes upper and lower notches 52a corresponding to the vertical grooves 54, and a horizontal open end 58a corresponding to the horizontal groove 58. [89] Fig. 17 shows another modified example of the bar-shaped hanger support 34 of Fig. 14. The first catch members 50 include the vertical grooves 54 and the horizontal groove 58 to realize the stable structure as described above. However, in this modified example, the horizontal groove 58 includes first and second horizontal grooves 58a, 58b that form a stepped structure, which is realized by forming the second horizontal groove 58b inwardly from and with greater dimensions than the first horizontal groove 58a. As a result, the second catch members 70 of the hanging devices 20, which are positioned in the second horizontal groove 58b, are more securely held in place and are not easily disengaged from the first catch members 50. [90] Further, the first catch members 50 may include reinforcing members 50a mounted on the first horizontal groove 58a to thereby form a greater stepped configuration between the first and second horizontal grooves 58a, 58b. [91] Fig. 18 is a perspective view of a bar-shaped hanger support 34 according to a third exemplary embodiment of the present invention. [92] With reference to Fig. 18, first catch members 50 respectively include vertical grooves 54 formed along a direction of the height of the bar-shaped hanger support 34, and front-to-rear grooves 56 formed extending in a front-to-rear direction at locations corresponding to the vertical grooves 54. The vertical grooves 54 extend a pre¬ determined distance starting from the bottom of the bar-shaped hanger support 34, and the front-to-rear grooves 56 are formed at top ends of the vertical grooves 54. With this structure, second catch members 70 are positioned in the front-to-rear grooves 56, and connecting members 72 extend through the vertical grooves 54. The vertical grooves 54 may extend through the entire width of the bar-shaped hanger support 34 (i.e., along the horizontal direction) or may extend a predetermined distance into the bar-shaped hanger support 34 starting from the front surface thereof. In this latter case, magnets 52 may be mounted respectively in the vertical grooves 54. [93] Fig. 19 shows a modified example of the bar-shaped hanger support 34 of Fig. 18. The first catch members 50 respectively include reinforcing members 50a. The re¬ inforcing members 50a may be formed identically to the reinforcing members 50a shown in Figs. 11, 12, 13 to thereby achieve compatibility with various structures of the bar-shaped hanger support 34. However, since the vertical grooves 54 are formed only downwardly in this exemplary embodiment, the reinforcing members 50a include only lower notches 54a formed therein with upper notches 54a omitted from the con¬ figuration. [94] Fig. 20 is a perspective view of a bar-shaped hanger support 34 according to a fourth exemplary embodiment of the present invention. [95] First catch members 50 include vertical grooves 54 formed along a direction of the height of the bar-shaped hanger support 34, and front-to-rear grooves 56 formed in a front-to-rear direction of the bar-shaped hanger support 34 in a manner identical to that described with reference to the third exemplary embodiment. However, in this embodiment, the bar-shaped hanger support 34 has a triangular cross section. [96] Fig. 21 shows a modified example of the bar-shaped hanger support 34 of Fig. 20. The first catch members 50 respectively include reinforcing members 50a. The re¬ inforcing members 50a may be formed identically to the reinforcing members 50a shown in Figs. 11, 12, 13 to thereby achieve compatibility with various structures of the bar-shaped hanger support 34. However, since the vertical grooves 54 are formed only downwardly in this exemplary embodiment, the reinforcing members 50a are shown with only lower notches 54a formed therein with the upper notches 54a omitted from the configuration. [97] The bar-shaped hanger support 34 described above may have a cylindrical, triangular, quadrilateral, or polygonal cross section. That is, various shapes may be used to enhance the appearance of the bar-shaped hanger support 34. [98] The second catch members 70 are provided on the hanging devices 20 to enable hanging on the hooking structures formed by the first catch members 50. [99] Figs. 10-14 show perspective views of second catch members 70 of hanging devices 20 respectively according to first through fifth exemplary embodiments of the present invention. [100] With reference to the drawings, the second catch members 70 are formed to enable hanging on the hooking structures formed by the first catch members 50. The second catch members 70 may be formed to various shapes including spherical, multilateral, and cylindrical shapes. That is, the second catch member 70 is shown spherically formed in Fig. 22, rectangularly formed in Fig. 23, shaped as pyramid in Fig. 24, cylindrically formed in Fig. 25, and formed having a hexagonal cross section in Fig. 26. It is important only that the second catch members 70 are formed having a shape corresponding to the first catch members 50. For example, if the first catch members 50 are spherical, the second catch members 70 are preferably formed similarly in a spherical shape with a diameter greater than that of the first catch members 50. However, in this instance, the second catch members 70 may also be cylindrically formed, as long as secure hanging on the first catch members 50 is realized. The front- to-rear grooves 56 of the first catch members 50 may also be formed to various different shapes as described with reference to the different formation of the second catch members 70. The first and second catch members 50, 70 may also be semi- spherically shaped. [101] Fig. 27 is a perspective view of a display device according to a second exemplary embodiment of the present invention. [102] With reference to Fig. 27, the display device includes a hanger support 30 having a board-shaped hanger support 32 and a bar-shaped hanger support 34 as in the first exemplary embodiment. However, in this embodiment, the board-shaped hanger support 32 and the bar-shaped hanger support 34 are mounted to a frame 10 that is formed differently to that of the first exemplary embodiment. The second exemplary embodiment provides an example of how the board-shaped hanger support 32 and the bar-shaped hanger support 34 may be applied to a frame 10 formed to a variety of con¬ figurations. [103] Unlike the frame 10 shown in Figs. 1-3, the frame 10 in this embodiment may be mounted to a wall. The frame 10 includes a pair of vertical frame sections 16 for mounting to a wall, and protruding frame sections 18 mounted respectively to the vertical frame sections 16 and extending outwardly therefrom. The board-shaped hanger support 32 may be mounted on an upper surface of the protruding frame sections 18 as shown in Fig. 27. The bar-shaped hanger support 34 may also be mounted on the protruding frame sections 18. [104] Further, an interconnecting frame section 19 may extend from one of the vertical frame sections 16 to a corresponding one of the protruding frame sections 18. The in¬ terconnecting frame sections 19 provide further support to the protruding frame sections 18. With this structure, the board-shaped hanger support 32 may be mounted on the protruding frame sections 18, and the bar-shaped hanger support 34 may be mounted between the vertical frame sections 16 and the interconnecting frame sections 19. [105] In the display device of this exemplary embodiment, products may be stacked on the board-shaped hanger support 32, and/or hung on both the board-shaped hanger support 32 and the bar-shaped hanger support 34. [106] Fig. 28 is a perspective view of a display device according to a third exemplary embodiment of the present invention. [107] With reference to Fig. 28, the display device is formed to a hanger-type of con¬ figuration utilizing a bar-shaped hanger support 34. Any of the bar-shaped hanger supports 34 described with reference to Figs. 6-9 may be applied to the display device of this embodiment, and the same advantages and effects associated therewith may be achieved. This embodiment illustrates an example of application of the bar-shaped hanger support 34 to a frame 10 with various configurations. [108] In the present invention, each of the structural elements may be made of a wood material to provide for a more attractive and elegant overall appearance. Alternatively, a metal or plastic material may be used to increase the strength of the display device, as well as to reduce its manufacturing costs. [109] Further, in the case where the first catch members 50 are formed only to one side of the hanger support 30, a neat appearance is realized on the side of the display device where the first catch members 50 are not formed even if a large number of the hanging devices 20 are hung on the display device. [110] Fig. 29 is a perspective view of a display device according to a fourth exemplary embodiment of the present invention. [I l l] With reference to Fig. 29, the display device of this exemplary embodiment further adds a cover 80 to the configuration shown in Fig. 1. All other aspects of the display device are identical to those described with reference to Fig. 1. Hence, only the cover 80 will be described. [112] The cover 80 is mounted to a board-shaped hanger support 32 such that the first catch members 50 may be concealed and accessed as desired by manipulation of the cover 80. The cover 80 may be mounted to the board-shaped hanger support 32 utilizing a variety of different connecting configurations. In this embodiment, a hinge 82 is used to mount the cover 80 to the board-shaped hanger support 32. The cover 80 maintains a concealing state when not pivoted about the hinge 82 to thereby prevent in¬ advertent removal of hanging devices 20. [113] With reference to Fig. 30, magnets 84 are mounted respectively on opposing surfaces of the cover 80 and the board-shaped hanger support 32 (i.e., opposing surfaces when the cover 80 is in the closed state shown). Preferably, a plurality of the magnets 84 are mounted at opposing positions along the length of the cover 80 and the board-shaped hanger support 32. The magnets 84 ensure that the cover 80 is more firmly secured in its closed state against the board-shaped hanger support 32, thereby further preventing detachment of the hanging devices 20 from the board-shaped hanger support 32. [114] Fig. 31 is a perspective view of a display device according to a fifth exemplary embodiment of the present invention. [115] With reference to Fig. 31, in the display device of this embodiment, an example is provided illustrating how a cover 80 may be also mounted to a bar-shaped hanger support 34. Although the bar-shaped hanger support 34 is shown having a quadrilateral cross section, the cover 80 may be applied to the bar-shaped hanger support 34 formed having a variety of shapes as described above. [116] Fig. 32 is a perspective view of a bar-shaped hanger support 34 according to a fifth exemplary embodiment of the present invention. [117] With reference to Fig. 32, first catch members 50 in this exemplary embodiment include vertical grooves 54 formed within a front face of the bar-shaped hanger support 34 along a direction of the height of the same, insertion grooves 55 formed rearwardly from the vertical grooves 54 along the same direction and with greater dimensions than the vertical grooves 54, and center grooves 57 formed under the insertion grooves 55 in spatial communication with the vertical grooves 54 and extending approximately to a center of the insertion grooves 55. With this con- figuration, hooking structures are formed between the insertion grooves 55 and the center grooves 57. The vertical grooves 54 allow for the insertion of connecting members 72 of hanging devices 20 from the front of the bar-shaped hanger support 34, and the insertion grooves 55 allow for the insertion of second catch members 70 of the hanging devices 20 from the top of the bar-shaped hanger support 34. The second catch members 70 come to rest on the hooking structures formed between the center grooves 57 and the insertions grooves 55 to thereby maintain insertion states of the hanging devices 20. [118] With reference also to Fig. 33, the bar-shaped hanger support 34 may further include reinforcing members 50a positioned in the first catch members 50. The re¬ inforcing members 50a are made of a material that is stronger than that used for the first catch members 50. For example, the reinforcing members 50a are made of a metal material, preferably one that does not rust such as stainless steel or an aluminum alloy. The reinforcing members 50a prevent damage to the first catch members 50 as a result of loads transmitted through the connecting members 72 and the second catch members 70. Preferably, the reinforcing members 50a, as with the first catch members 50, are formed with an open structure that extends upwardly and downwardly, as well as forwardly and rearwardly. Such an open structure allows for insertion of the connecting members 72 and hanging of the second catch members 70. In the case where the bar-shaped hanger support 34 is made of a wood material, the reinforcing members 50a may be inserted into the first catch members 50 along a length of the same, while if the bar-shaped hanger support 34 is made of a plastic material, the re¬ inforcing members 50a may be mounted in the first catch members 50 using an insert formation method. [119] Fig. 34 shows a modified example of the bar-shaped hanger support 34 of Fig. 32, in which a cover 80 has been included in the configuration. Except for this addition of the cover 80, all other aspects of the display device are identical to those of the display device shown in Fig. 32. Therefore, a detailed description of other parts of the display device will not be provided. [120] As in the case of the display device shown in Fig. 31, the cover 80 is mounted to the bar-shaped hanger support 34 such that the first catch members 50 may be concealed and accessed as desired by manipulation of the cover 80. The cover 80 may be mounted to the bar-shaped hanger support 34 utilizing a variety of different connecting configurations. In this embodiment, a hinge 82 is used to mount the cover 80 to the bar-shaped hanger support 34. The cover 80 maintains a concealing state when not pivoted about the hinge 82 to thereby prevent inadvertent removal of hanging devices 20, as well as to enhance the overall appearance of the display device. [121] Fig. 35 is a perspective view of a bar-shaped hanger support 34 according to a sixth exemplary embodiment of the present invention. [122] With reference to Fig. 35, first catch members 50 in this exemplary embodiment include vertical grooves 54 formed within a front face of the bar-shaped hanger support 34 along a direction of the height of the same, insertion grooves 55 formed rearwardly from the vertical grooves 54 along the same direction and with greater dimensions than the vertical grooves 54, and center grooves 57 formed within the insertion grooves 55 at approximately a center position thereof (i.e., a center of the height of the insertion grooves 55) and in spatial communication with the vertical grooves 54. Hooking structures are formed by the center grooves 57. The vertical grooves 54 allow for the insertion of connecting members 72 of hanging devices 20 from the front of the bar-shaped hanger support 34, and the insertion grooves 55 allow for the insertion of second catch members 70 of the hanging devices 20 from the top of the bar-shaped hanger support 34. The second catch members 70 come to rest on the hooking structures formed by the center grooves 57 to thereby maintain insertion states of the hanging devices 20. As is evident from Fig. 35, in this exemplary embodiment, the bar-shaped hanger support 34 may be inverted and operate identically. [123] Fig. 36 is a partial perspective view of a reinforcing member 50a of Fig. 35, and Fig. 37 is a sectional view taken along line B-B of Fig. 35. [124] With reference to these drawings together with Fig. 35, the bar-shaped hanger support 34 may further include reinforcing members 50a positioned in the first catch members 50. The reinforcing members 50a are made of a material that is stronger than that used for the first catch members 50. For example, the reinforcing members 50a are made of a metal material, preferably one that does not rust such as stainless steel or an aluminum alloy. The reinforcing members 50a prevent damage to the first catch members 50 as a result of loads transmitted through the connecting members 72 and the second catch members 70. Preferably, the reinforcing members 50a, as with the first catch members 50, are formed with an open structure that extends upwardly and downwardly, as well as forwardly. The forward open structure allows for insertion of the second catch members 70, while the upward and downward open structure allows for insertion of the connecting members 72 and hanging of the second catch members 70. In the case where the bar-shaped hanger support 34 is made of a wood material, the reinforcing members 50a may be inserted into the first catch members 50 along a length of the same, while if the bar-shaped hanger support 34 is made of a plastic material, the reinforcing members 50a may be mounted in the first catch members 50 using an insert formation method.