A display for displaying a high-hierarchical menu and a lower-hierarchical menu corresponding to the high hierarchical menu on a display section, the high-hierarchical menu is displayed on the front side of a virtual cubic menu on the display section, and when it is recognized that the cubic menu has been selected by an inputting operation, the cubic menu is turned and the turning process is displayed with preset interpolation images and then the lower-hierarchical menu is displayed on the top side after the cubic menu is turned. In this manner, the visible continuousness of the change from the high-hierarchical menu to the lower-hierarchical menu can be maintained, thus making it possible to allow the user to easily recognize the change from the high-hierarchical menu to the lower-hierarchical menu.