| 摘要 |
A navigation device includes a data relation definition analysis unit 3 for analyzing a relation between data which construct map data in a map DB, the relation being defined in a data relation definition inputted thereto by a data relation definition input unit 2, a data relation information generating unit 4 for generating data relation information in which data related to each other which construct map data in the map DB are set on the basis of results of the analysis of the data relation definition by the data relation definition analysis unit 3, a navigation function performing unit 13b for performing navigation processing, and a data access unit 14a for referring to data relation information of map data for use in the navigation function performing unit 13b when performing the navigation processing to acquire the above-mentioned map data from the map DB. |
