| 摘要 |
A reading unit reads position information on a home point of a user, position information on a registered point associated with the user or a user's device and stored in a storage medium, first map data same as map data used by the user in version, and second map data newer than the first map data in version. A route calculating unit calculates a new route from the home point to the registered point based on the second map data. A new additional road extracting unit extracts a new additional road, which is specified in the second map data and is not specified in the first map data, from the new route. A transmitting unit extracts road data of the extracted new additional road from the second map data and transmits the extracted road data to be used by the user's device.
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