| 摘要 |
PROBLEM TO BE SOLVED: To provide a map delivery system capable of acquiring only necessary map information by a simple constitution. SOLUTION: A terminal device 100 determines the range of a map to be required to a center device 200, extracts all map units covering the range, and transmits the ID and the version of the extracted map unit respectively to the center device 200. The center device 200 receives the ID and the version of the map unit from the terminal device 100. When the version is zero, or when the version is older than versions stored in the center device 200, the center device 200 registers the ID of the map unit of the version in a return list, and transmits map information and the version in the map unit having the registered ID respectively to the terminal device 100. COPYRIGHT: (C)2005,JPO&NCIPI |
