| 摘要 |
The present invention includes a map information storage unit which stores map information, an information read-out device which reads out the map information stored in said map information storage unit, a display which displays on a screen the map information read out by the map information read-out device from the map information storage unit, a route map preparing device which prepares on the displayed map all the routes made up of line segments connecting the starting point and the successive passing points up to the end point, and a device for detecting the present position of the vehicle. The present invention further includes a control device which carries out control operations so that a subscreen displaying the above-described map including all the routes and the present position of the vehicle is displayed on the screen displaying the map information read out by said information read-out device and the present position of the vehicle detected by said device for detecting the present position of the vehicle.
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