To obtain a new GUI (graphical user interface) that is easily used by a user by corresponding to an operation device mounted by the adoption of new design.

A portable telephone terminal is provided with a four-directional jog device 3 capable of a rotation operation, a pressing operation and an extraction operation. When the four-directional jog device 3 is subjected to the rotation operation as shown in the arrow Ya, the portable telephone terminal displays ((B) of Figure 5) a menu image L1 of a first hierarchy on a display 4. When the four-directional jog device 3 is subjected to the pressing operation to the arrow Yb while the menu image L1 of the first hierarchy is displayed, the portable telephone terminal displays ((C) of Figure 5) a menu image L2 of a low order second hierarchy on the display 4. On the contrary, when the four-directional jog device 3 is subjected to the extraction operation, the portable telephone terminal displays a menu image of a high order hierarchy on the display 4.