| 摘要 |
A map update system includes a map server in which map information created by map database information stored in a map information database is hierarchized according to the area size of the map information and stored. If map information of a lower hierarchy required for an upper hierarchy or a navigation device is updated, update is reported to the navigation device. Moreover, if the map database information is updated, map information assigned to a hierarchy in accordance with the importance of the place and building indicated by the updated portion of the map database information is updated.
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