A touch panel 47 is constructed by a display/sensor unit 51a which is slightly larger than a display screen of an LCD 46 and a sensor unit 51b which is projected to the outside from one side, for example, from one side on the right. A finger 52 of the user is touched to a selection item such as desired button, icon, or the like on the display/sensor unit 51a and vertically moved on the sensor unit 51b. A selection display 53 constructed by a plurality of buttons is displayed along the side of the right side of the display screen by the LCD 46. A button beside the finger 52 is highlighted and when the finger 52 is released, the highlighted button is selected. If there are no buttons adjacent to the finger 52, the button is not highlighted. Even if the finger 52 is released, the state is not changed. When finger 52 is moved to the display/sensor unit 51a, the selection display 53 disappears.