Patent ID: 6879909

Claim:
A map display control apparatus comprising: a map display control unit that controls a display device so as to display a map on the display device based upon map display data; a communication control unit that connects with a second control apparatus via a digital mobile telephone system to engage in exchange of digital data; a map information transmission unit that transmits information related to the map currently displayed on the display device to the second control apparatus via the communication control unit, the information related to the map being sufficient information to allow the second control apparatus to reproduce the map currently displayed on the display device; and a map information reception unit that receives from the second control apparatus via the communication control unit information related to an updated map based upon the reproduced map by the second control apparatus from the sufficient information, wherein: the map display control unit controls the display device so as to update the map displayed on the display device based upon the information related to the updated map received at the map information reception unit.