A car navigation system includes a liquid crystal display having a touch screen on its screen, a sound output device, and a control device. The control device determines whether a vehicle is traveling or stopping and switches display modes regarding an input window on the screen between a usual display mode and a restricted display mode. In the restricted display mode, only a certain selection item of several selection items included in a list is visibly displayed along with a cursor and selectable. A responsive area used to order movement of the cursor is defined to expand a displayed area of the cursor movement key, while a responsive area used to select the certain selection item is defined to expand a displayed area of the certain selection item to an entire area for displaying the list.