METHOD FOR PROVIDING CONTINUOUS DOWNLOADING SERVICE OF LARGE SIZE CONTENTS THROUGH WIRELESS NETWORK AND RECORD MEDIA RECORED PROGRAM FOR

REALIZING THE SAME

Technical Field

[1] The present invention relates to data transmission over a wireless network, particularly to methods and program-storing media for continuous downloading of large- size content data over a wireless network by managing a temporary file of plural contents and organizing content data into multiple files.

[2]

Background Art

[3] Recently, through the rapid development of the Internet, lots of people are provided with various content data through the Internet.

[4] The term content refers to various kinds of information or contents, such as not only text, music, game and movie but also executable programs for reproducing the above- mentioned contents on a user terminal, provided over the Internet,.

[5] The content used to be downloaded through the landline Internet and to be played on a desktop PC or a notebook computer. However, since cellular phones or PDAs (Personal Digital Assistants) have become popular nowadays, the needs to use the content on mobile terminals are also increasing.

[6] Currently, it is possible to provide several mega-bytes to several gigabytes of content due to the technological development of multimedia data transmission over the landline Internet and improved performance of desktop PCs or notebook computers, but in providing the content to mobile terminals, only small-size contents can be sent to mobile terminals due to the limited memory capacity, lagging performance of mobile terminals and instability of wireless networks.

[7] In transmitting the content over a wireless network, the content transmission process may be suspended when the mobile terminal goes out of the communication coverage or is turned off.

[8] When a user requests the download of the content, which was suspended previously, it is common that a continuous download service to download the remaining part of the file is not available because the size of the content was small.

[9] Although continuous download services are available these days, these services are still very much limited because the probability of disconnection increases in proportion

to the increase in content size.

[10] Generally, in downloading the content through a wireless network, the mobile terminal stores the data being downloaded in the form of a temporary file and converts it into an executable file after the download is finished.

[11] Since a conventional mobile terminal can accommodate one temporary file only due to the limited memory capacity, it is possible for the mobile terminal to continue the download by using the stored temporary file only when the retransmission request for the suspended content is made right after the suspension occurred. However, the mobile terminal must delete the old temporary file and generate a new temporary file if the user requests to download another content.

[12] Thus, if there is no download request for the suspended content successively, the partially downloaded content must be downloaded from the beginning.

[13] Generally, the charge for the content is made only after finishing the transmission of the content. For example, in downloading a 100-megabyte content, a wireless communication service provider (hereinafter, carrier ) can charge for the content download only when the whole content is downloaded. If 30 megabytes of the 100-megabyte content were downloaded at first and then the remaining 70 megabytes were downloaded by using the continuous download service, the carrier could not charge for these continuous downloads because the first 30 megabytes and the last 70 megabytes were regarded as incomplete downloads of the content.

[14] Also, since the content is usually organized into one file, if there is a patch file for the content, the whole content to which the patch file is applied (hereinafter, patched content ) must be downloaded again. However, if the user requestes a download of the suspended content and there is a patch file for the requested content, the remaining content will be download first and then the patched content will be download again, making the user download almost the same content twice.

[15]

Disclosure of Invention Technical Problem

[16] To overcome the aforementioned shortcomings of prior art, the present invention proposes a method and a program-storing medium for providing continuous downloads of more than one large-size contents over a wireless network.

[17] Another object of the present invention is to provide a method and a program- storing medium for providing continuous downloads of large-size contents over a wireless network that makes it possible to charge for the content download even if transmission of the content is suspended.

[18] Still another object of the present invention is to provide a method and a program-

storing medium for providing continuous downloads of large-size contents over a wireless network that allows a patch file to be downloaded without downloading the whole patched content.

[19]

Technical Solution

[20] To achieve the aforementioned objects, according to a preferred embodiment of the present invention, there is provided. A method of providing a continuous downloading service of large size content through a wireless network consisting of a mobile terminal and a content server, the method comprising: receiving a request for continuous download of content from the mobile terminal, wherein the content consists of plural individual files; receiving a package list from the mobile terminal, wherein the package list comprises a master ID of the content and information of an individual file; comparing information of an individual file in the received package list and information of an individual file in the content server; and transmitting a required file list indicating at least one individual file having different information in the received package list and the store package list to the mobile terminal, wherein the required file list comprises a content unified version, wherein a download program installed in the mobile terminal receives the required file list and determines the continuous download.

[21] Also, to achieve the aforementioned objects, according to a preferred embodiment of the present invention, there is provided. A computer readable medium including a program containing computer-executable instructions for performing the method for providing a continuous downloading service of large size content through a wireless network consisting of a mobile terminal and a content server, wherein the program performs the steps of: transmitting a request for continuous download of content to the content server, wherein content consists of plural individual files; receiving a latest package list being stored in the content server, wherein the latest package list comprises a master ID of the content, an unified version and information of an individual file; determining the continuous download based on the unified version. Advantageous Effects

[22] According to the invention, since it is possible to manage plural temporary files for downloading plural contents, in case of suspension of content download, a successive request for continuous download right after the suspension happened is not needed any more.

[23] Also, according to the present invention, it is possible to download the latest patch file rather than downloading the remaining part of the suspended file using a unified version in the package list. Brief Description of the Drawings

[24] FlG. 1 is block diagram of a content providing system according to a preferred embodiment of the present invention; [25] FlG. 2 shows modules consisting of a content server according to a preferred embodiment of the present invention; [26] FlG. 3 shows modules consisting of a download agent program according to a preferred embodiment of the present invention; [27] FlG. 4 shows package list information according to a preferred embodiment of the present invention; [28] FlG. 5 shows configuration data of an executable file according to a preferred embodiment of the present invention; [29] FlG. 6 shows configuration data of a DLL file according to a preferred embodiment of the present invention; [30] FlG. 7 shows configuration data of a resource file according to a preferred em bodiment of the present invention; [31] FlG. 8 shows configuration data of an item file according to a preferred embodiment of the present invention; [32] FlG. 9 shows a temporary file according to a preferred embodiment of the present invention; [33] FlG. 10 is a flowchart of continuous content download according to one embodiment of the present invention; [34] FlG. 11 shows modules consisting of a download agent program according to another preferred embodiment of the present invention; and [35] FlG. 12 is a flowchart of continuous content download according to another embodiment of the present invention. [36]

Mode for the Invention [37] Hereinafter, preferred embodiments of the method and program-storing medium for providing continuous downloads of large-size contents over a wireless network according to the present invention will be described in detail with the accompanying drawings. [38] FlG. 1 is block diagram of a content providing system according to a preferred embodiment of the present invention. [39] As shown in FlG. 1, the content providing system may comprise a mobile terminal

100 and a content server 108, both of which are connected to each other through a network. [40] The network may be a wireless network including BTS (Base Transceiver Station),

BSC (Base Station Controller) and PDSN (Packet Data Serving Node), and the mobile

terminal 100 can access the content server 108 through the above network elements and be provided with various contents from the content server 108. [41] Generally, content refers to music data or movie data being provided over a network such as the Internet. However, in this specification, the content further comprises an executable file for reproducing the above-mentioned data and link programs (e.g., DLL program). So, the content indicates all data being transmitted through a network. [42] The mobile terminal 100 can be one of a conventional cellular phone, an MBS

(Mobile Broadcast System), and so on. [43] According to the present invention, the mobile terminal 100 comprises a wireless

Internet browser 102, a download agent program 104 and a content storage 106. [44] The wireless Internet browser 102 for displaying a content list or an item list being provided by the content server 108 can be one of a WAP (Wireless Application

Protocol) browser, an ME (Mobile Explorer) and so on. [45] According to the present invention, the content server 108 organizes the content into several files (hereinafter, multi files or plural individual files ) such as an executable file (EXE file), a link file, a resource file (RES), an item file, etc., rather than one file, and stores them. And, if a user requests the download, the content server

108 generates a package list comprising information of multi files and transmits the package list with multi files to the mobile terminal 100. [46] The executable file is continuously loaded on the memory when certain content is reproducing. [47] The link file, such as a DLL (Dynamic Library Link) file, is linked to the executable file that uses the link file during the execution rather than compiling with the executable file that is loaded onto the memory of the mobile terminal 100, and is for an efficient use of the memory, reuse of developed software, development for structural software, etc. [48] In addition, the resource file is, for example, a file for game graphic in case the content is a game, and a skin file in case the content is a reproducing program such as a

VOD player. [49] The item file is for extending the function of resources, such as an extension file of cars or tracks in a racing game or a file for skin change or skin extension in a VOD player. [50] The package list information comprises a master ID of the content, unified version data, an ID and the size of an executable file, and the number, ID and size of DLL, resource and item files. [51] After receiving the package list information from the content server 108, the download agent program 104 requests multi files being included in the package list in-

formation successively to the content server 108, and checks whether the transmission of each multi file is finished.

[52] At this moment, the download agent program 104 stores the file being downloaded in the form of a temporary file, then renames and stores the file if the download is completed.

[53] According to a preferred embodiment of the present invention, when a user wants continuous download after the content transmission is suspended, the download agent program 104 stores the information on the temporary file such that the continuous download is possible. Also, since the download agent program 104 can manage more than one temporary file for plural contents, it is possible to do the continuous download of the previously suspended content even if the request for download is not made right after the suspension happened.

[54] At this moment, the temporary file information, as shown in FlG. 6, may comprise content information, a temporary file ID and the size of the temporary file, and the content information may comprise a master ID and unified version data of the content.

[55] According to a preferred embodiment of the present invention, on receiving the continuous download request, the mobile terminal 100 transmits the stored package list to the content server 108. On receiving the package list, the content server 108 extracts the latest package list for the content and compares the information of individual files in the latest package list with the information of individual files in the received package list to check for disagreement on individual file in each package list. Then the content server 108 generates a required file list based on the disagreement and transmits the required file list to the mobile terminal 100.

[56] Each of the plural individual files may comprise an ID, size and version data, and the disagreement on the information of individual file indicates that two files having the same ID have different sizes or version data. In this case, a patch file or a recovery file (a file that was already downloaded but deleted by a user) will be needed (Hereinafter, a patch file or a recovery file will be referred to as a required file ).

[57] The required file list may comprise the latest unified version data of the content being stored in the content server 108, and if the latest unified version data is the same as the unified version of the content being stored in the mobile terminal 100, the continuous download will begin.

[58] In the continuous download according to the present invention, the mobile terminal

100 transmits the size of the file that was suspended and stored in the form of a temporary file to the content server 108, and receives the remaining size of the temporary file successively.

[59] This continuous download can be applied not only to the first suspended transmission of the content download but also to the suspended transmission of the

patch file or extension package.

[60] In addition, according to another embodiment of the present invention, a comparing process of individual files for continuous download can be performed in the mobile terminal 100.

[61] That is, on receiving the continuous download request, the download agent program

104 of the mobile terminal 100 receives the latest package list from the content server 108 and compares the information of individual files in the latest package list with the information of individual files in the received package list. If the unified version data in the latest packet list is the same as the unified version data in the mobile terminal 100, the continuous download will be performed.

[62] in addition, on receiving the continuous download request, if there is a patch file and the version of the content is updated, the download of patch file or recovery file will be performed rather than the continuous download of the content.

[63] According to one embodiment of the present invention, if the unified version of the required file list being received from the content server 108 is different from the unified version data of the content already stored in the mobile terminal 100, the download agent program 104 deletes the stored temporary file and starts to download and store the required file.

[64] In addition, according to one embodiment of the present invention, if the unified version of the latest package list being received from the content server 108 is different from the unified version data of the content already stored in the mobile terminal 100, the download agent program 104 deletes the stored temporary file and starts to download and store the required file.

[65] The content storage 106 stores all kinds of contents downloaded from the content server 108, and may be an internal memory of the mobile terminal 100 or an external memory for storing large-size contents.

[66] FlG. 2 shows modules consisting of the content server according to a preferred embodiment of the present invention.

[67] As shown in FlG. 2, the content server 108 according to the present invention comprises a content list providing module 200, a package list generating module 202, a version comparing module 204, an individual file comparing module 206, a COD (Compile On Demand) module 208, an encryption module 210, an application transmitting module 212, a resource transmitting module 214, an authentication key providing module 216 and a billing module.

[68] The content list providing module 200 provides a content list and item list to the mobile terminal being connected to the content server 108. The content list providing module 200 can be included within the content server, but it can be implemented as an independent server.

[69] The package list generating module 202 generates a package list for multi files consisting of certain contents.

[70] The content server 108 according to the present invention organizes the content to be downloaded to the mobile terminal 100 into multi files, and generates a package list for these multi files.

[71] FlG. 4 shows the package list information according to a preferred embodiment of the present invention. As shown in FlG. 4, the package list information according to the present invention comprises a content master ID, a content unified version, the number of executable files, executable file configuration data, the number of DLL files, DLL file configuration data, the number of resource files, resource file configuration data, the number of item files and item file configuration data.

[72] The content master ID is a content identifier, and the content unified version indicates that certain content is a basic package or an extension package and shows a patch version status.

[73] According to a preferred embodiment of the present invention, it is preferable that the number of executable file is one. Configuration data of the executable file may comprise, for one executable file, as shown in FlG. 5, an executable file ID, version data, the size and billing data.

[74] Content unified version data can be represented in the form of major/middle/minor such as l.x.x or 2.x.x. The major number is an identification number for identifying the basic package or extension package, and middle and minor numbers are for identifying the patch.

[75] In addition, the number of DLL files, resource files and item files depends on the kind of content, and each configuration data, as shown in FlGs. 6-8, comprises an ID of each file, version data, the size and billing data.

[76] In addition, the item file is for extending resources and does not need to be included in the first download of the content.

[77] The package list generating module 202 according to the present invention generates a packet list having information of multi files on receiving a content request and sends it to the content list providing module 200, and the content list providing module 200 transmits the package list information to the mobile terminal 100.

[78] Additionally, in order to avoid confusion of the terms, the package list to be downloaded to the mobile terminal 100 before requesting the continuous download will be defined as the first package list, the package list to be downloaded stored in the mobile terminal and to be transmitted to the content server on requesting the continuous download will be defined as the second package list, and the latest package list to be extracted from the content server 108 and to be downloaded to the mobile terminal 100 will be defined as the third package list.

[79] The second package list and the first package list will be identical.

[80] Then, when the downloading of multi files starts, the download agent program 104 of the mobile terminal 100 checks all multi files included in the package list that was already provided, and stores the file being downloaded in the form of a temporary file. [81] Also, the download agent program 104 of the present invention designates a folder for plural contents to store the temporary file. [82] According to a preferred embodiment of the present invention, when a user wants the continuous download of the previously suspended file, the download agent program 104 will transmit the second package list to the content server 108. [83] In one embodiment of the present invention, the second package list may comprise a content master ID. [84] At this moment, the version comparing module 204 of the content server 108 will compare unified version data in the second package list and unified version data in the third package list. [85] Then, the individual file comparing module 206 compares information of individual files in the second package list and information of individual file in the third package list, and generates a required file list. [86] The mobile terminal 100 receives the required file list and requests download of individual files included in the required file list to the content server 108. If the continuous download is needed due to the same unified version, the mobile terminal

100 transmits the size data of the already stored temporary file to the content server

108. The content server 108 transmits the remaining size of the temporary file to the mobile terminal 100, and also transmits multi files in a lower level than the suspended temporary file to accomplish the continuous download. [87] The COD module 208 compiles an executable file and an DLL file needed to be compiled among multi files. [88] The COD module 208 is a key component of WIPI (Wireless Internet Platform for

Interoperability) for the wireless Internet platform standard under discussion. [89] According to the present invention, the executable file or the DLL file among multi files consisting of the content needs to be complied, and the COD module 208 will compile these kinds of files.

[90] The encryption module 210 encodes each multi file, if necessary.

[91] The application transmitting module 212 transmits an executable file and a DLL file among multi files to the mobile terminal 100. Namely, the game application transmitting module 212 transmits the compiled file such as an executable file and a

DLL file that the COD module 208 compiled. [92] The resource transmitting module 214 transmits a resource file and an item file, both of which do not need to be compiled, to the mobile terminal 100.

[93] An item file is for extension of resources, such as, for example, a graphic expression extension of game, an additional skin of each player, etc., and there is no need to download the item file at the first content download.

[94] When a carrier provides the content in the previous way, whole files were compiled into one file, and then the compiled file was transmitted. In this case, the carrier that operates the content server could not provide files that were not compiled at the same time.

[95] However, according to the present invention, it becomes possible to transmit a compiled file and a resource file that do not need to be compiled such that it also becomes possible for a carrier to transmit multi files at one time by using the package list information.

[96] The authentication key providing module 216 transmits an authentication key, for decoding the encoded files for content protection, to the mobile terminal 100.

[97] The billing module charges the files being downloaded to the mobile terminal 100.

[98] Conventionally, an individual content was consisted of one file, and it was possible to charge the content download only when the download of the whole content was completed by checking the size of the content. However, since different parts of the invidual content were downloaded at different times in case of the continuous download, it is impossible for the carrier to charge each download because the carrier regarded each download as an incomplete download.

[99] However, according to the present invention, since one content is organized into multi files, it is possible to use various charge policies. For example, in case of charging a basic fee for the first downloaded content, when the download of the first file among multi files included in the package list is completed, it is possible to charge the basic fee for the whole content and not to charge for remaining files to be downloaded by treating these remaining files as exceptional cases.

[100] Even if there is a continuous download request for the content, the basic fee was already charged so that it becomes possible to avoid charging for the continuous download again.

[101] Also, in case of charging for the download of the content in proportion to the amount of packets, since the content according to the present invention is organized into several small files and multi files that include the billing data respectively, it becomes easier to check whether the download of each multi file is complete and possible to charge for each multi file individually.

[102] In addition, although it was described that the modules in the content server 108 provide the content according to the user s request, this is merely one embodiment of the present invention, and each module can be included in different servers in an alternative embodiment.

[103] Also, although it was described that part of the temporary file or multi files having a lower level than the temporary file were downloaded when the multi files organizing one content were downloaded continuously, and the download of one of the multi files was suspended, this is merely one embodiment of the present invention, and it is possible to download multi files randomly. And it is also possible to download a file that is not downloaded through comparing the sizes of individual multi files included in the second package list and the third package list one by one.

[104] FlG. 3 shows modules consisting of the download agent program according to a preferred embodiment of the present invention.

[105] As shown in FlG. 3, the download agent program according to the present invention comprises a temporary file managing module 300, a transmission completion determining module 302, a package list transmitting module 304, a required file list receiving module 306, a version comparing module 308 and a temporary file size transmitting module 310.

[106] When downloading multi files consisting of one content, the temporary file managing module 300 stores the file being downloaded in the form of a temporary file, and renames the temporary file after completing the download to store it as an actual file.

[107] Also, in case of suspending the download of multi files, the temporary file managing module 300 stores the information about the suspended temporary file to enable the downloading the remaining amount of the temporary file from the content server 108.

[108] In addition, as described above, even if there is a request for continuous download, the request will be discarded and the latest patch file will be downloaded if the content unified versions of the second package list and required file list are not the same. In this case, the temporary file managing module 300 deletes the stored temporary file.

[109] However, in case the unified versions are not the same, it is possible to ask the user whether he or she wants to download the latest patch file, and it is preferable to delete the stored temporary file and receive the patch file only when the user selects to download the patch file.

[110] According to the present invention, the temporary file managing module 300 stores temporary files of each content by assigning plural contents to plural individual folders and, if there is a request for continuous download of one of the plural contents, stores the remaining part of the requested content in the folder where the temporary file corresponding to the requested content was already stored in.

[Ill] Thus, according to the present invention, the continuous download becomes possible unless the request was made right after the suspension happened.

[112] The transmission completion determining module 302 checks whether the

download of all multi files included in the package list being sent from the content server 108 is completed.

[113] When the content server 108 compares the information of individual files according to one embodiment of the present invention, the package list transmitting module 304 sends the package list of the content (the second package list) stored in the mobile terminal content server 108 to the content server 108.

[114] According to one embodiment of the present invention, the second package list to be sent to the content server 108 may comprise a master ID of the content, an ID, the size and individual version data of each individual file.

[115] After comparing the information of individual files, the content server 108 generates a list of files (the required file list) to be downloaded to the mobile terminal 100, and the required file list receiving module 306 receives the required file list.

[116] The version comparing module 308 checks whether the unified version data in the required file list and the second package list are the same to determine whether or not to perform the continuous download.

[117] If the continuous download is required because the unified versions are the same, the temporary file size transmitting module 310 transmits the size data of the suspended temporary file to the content server 108. By using the size data, the content server 108 can download the remaining part of the temporary file.

[118] FlG. 10 is a flowchart of continuous content download according to one embodiment of the present invention.

[119] Referring to FlG. 10, the mobile terminal 100 requests the download of a specific content to the content server 108 (SlOOO). The download request for the content may comprise a first request for the content and a download request for a patch and an extension package of the content that is already stored in the mobile terminal 100.

[120] According to the download request from the mobile terminal 100, the content server

108 generates the first package list information about multi files consisting of one content (S 1002), and then transmits it to the mobile terminal (S 1004).

[121] Then, the content server 108 downloads multi files being included in the first package list to the mobile terminal 100(S 1006), and the mobile terminal 100 stores the multi file being downloaded in the form of a temporary file (S 1008).

[122] As described above, when each download of multi files is completed, the mobile terminal 100 renames the download-completed temporary file by an actual file name to store.

[123] If the download is suspended due to instability of a wireless network during the download of multi files (SlOlO), the mobile terminal 100 transmits the request for continuous download of the suspended file to the content server 108 (S 1012).

[124] According to one embodiment of the present invention, since the content server 108

compares information of individual files, the mobile terminal 100 transmits the second package list comprising a content master ID, and an ID, the size and individual version data of individual files to the content server 108 (S 1014) when receiving the request of continuous download.

[125] After receiving the second package list, the content server 108 extracts the third package list of the requested content stored thereon (S 1016), and compares information of individual files in the second package list and the third package list (S 1018).

[126] Through the individual file comparing process, the content server 108 generates a required file list (S 1020), and transmits the required file list to the mobile terminal 100(S 1022).

[127] The mobile terminal 100 check whether the unified version of the required file list and unified version of the content already stored in the mobile terminal 100 are the same (S 1024).

[128] In case the unified versions are the same, the continuous download will be performed, that is, the mobile terminal 100 transmits the size data of the temporary file to the content server 108(S 1026), and the content server 108 downloads the required file successively. The continuous download of the required file is downloading the remaining part of the temporary file and other files in a lower order than the temporary file.

[129] However, in case the unified versions are different in step S 1024, the mobile terminal 100 deletes the stored temporary file (S 1030), then requests for the required file list to the content server 108 (S 1032). The content server 108 downloads required file to the mobile terminal 100 (S 1034).

[130] FlG. 11 shows modules consisting of the download agent program according to another preferred embodiment of the present invention.

[131] FlG. 11 shows that the download agent program compares information of individual files when the user requests for the continuous download. As shown in FlG. 11, the download agent program according to another embodiment of the present invention comprises a temporary file managing module 1100, a transmission completion determining module 1102, a basic content data transmitting module 1104, a package list receiving module 1106, a version comparing module 1106, an individual file comparing module 1108 and a temporary file size transmitting module 1112.

[132] The temporary file managing module, the transmission completion determining module and the temporary file size transmitting module are already described in FlG. 3, so the same description will be omitted.

[133] When the user requests for the continuous download such that the basic content data transmitting module 1104 transmits the basic content data comprising a master ID of the content for continuous download to the content server 108 in order that the content

server compares the unified versions. [134] The content server 108 extracts the third package list information of the requested content using the content master ID received from the mobile terminal 100, and transmits to the mobile terminal 100, and the package list receiving module 1106 receives it. [135] According to the present invention, the mobile terminal 100 is storing the second package list at the moment of downloading the content, and the version comparing module 1108 compares the unified version in the second package list and the unified version in the third package list being transmitted from the content server 108. [136] If the unified versions are not the same, the temporary file managing module 1100 deletes the already-stored temporary file. [137] The individual file comparing module 810 compares information of individual files in the third package list and information of individual files in the mobile terminal 100, and can request for a file download to the content server 108 if the information of individual files is not same. [138] [139] FlG. 12 is a flowchart of continuous content download according to another embodiment of the present invention. [140] Referring to FlG. 12, the mobile terminal 100 requests for the content download to the content server 108 (S 1200), and the content server 108 generates the first package list for the requested content (S 1202) and transmits it to the mobile terminal 100

(S 1204). [141] Then, the content server 108 downloads multi files included in the first package list to the mobile terminal 100(S 1206), and the mobile terminal stores the multi files being downloaded in the form of a temporary file (S 1208). [142] The download is suspended due to instability of a wireless network during the download of multi files (S 1210), and if the mobile terminal 100 transmits the request of continuous download to the content server 108(S 1212), the content server 108 transmits the third package list of the content currently stored in the content server 108 to the mobile terminal (S 1214). [143] On receiving the third package list, the mobile terminal 100 compares the unified version of the content stored thereon and the unified version in the third package list

(S1216). [144] In case the unified versions are the same, the mobile terminal 100 transmits the size data of the temporary file stored thereon to the content server 108(S 1218), and the content server 108 downloads the required file (S 1220). [145] However, in case the unified versions are different in step S916, the mobile terminal

100 deletes the stored temporary file (S 1222) because the latest patch file must be

downloaded if the versions are not the same.

[146] As described above, in case the versions are different, the mobile terminal may ask to the user whether he or she wants to download the latest patch file, and then can delete the temporary file if the user wants to download the patch file.

[147] For the request for a required file, the mobile terminal 100 compares the third package list from the content server 108 and information of individual files being stored thereon (S 1224), and then requests for the download of files, of which the information is not the same, to the content server 108 (S 1226).

[148] According to the mobile terminal 100, the content server 108 transmits the requested patch file (S 1228).

[149]

Industrial Applicability

[150] The aforementioned embodiments are only for describing the present invention, so those who are skilled in the art can make various changes, alternatives and addition to the present invention without departing from the spirits and scope of the present invention, and these changes, alternatives and addition must be interpreted as being involved to the following claims.

[151]