Abstract: For a plurality of points of interest associated with each other, a plurality of pieces of point of interest name data representing names of points of interest is stored in association with a single piece of telephone number data. When a telephone number is entered, a plurality of pieces of point of interest name data is displayed so as to be selectable.

Abstract: The invention provides a method of displaying maps for a vehicle navigation unit that displays a wide area map and an expanded map simultaneously on the display screen, and scrolls the detailed map on a cursor screen synchronously with a cursor movement on the wide area map, thereby facilitating the driver's comprehension of the vehicle's position on the map.

Abstract: Desired switch images are freely shifted and grouped by the operator, so that the switch images can be superimposed to be displayed. A plurality of layers arranged from the lowest layer to the highest layer are provided for the respective switch images. The layer numbers and the switch image data of the switch images corresponding to the respective layer numbers are managed. If switch images are superimposed on each other, the higher-layer switch image is displayed on the lower-layer switch image on the display screen. If a shifted switch image is not superimposed on any of the previously-superimposed images, the layer numbers of all of the switch images higher than the layer number of the shifted switch image are subtracted by one, and also, the layer number of the shifted switch image is set to be the highest number. Then, the shifted switch image is written into the corresponding zone of the screen memory, so that the overall shifted switch image can be displayed on the frontmost position of the screen.