| 摘要 |
A navigation system includes data management data that determines storage locations of real data from data definition information indicating a data structure of a map DB 10d, a data access program that describes an access function to the real data whose data structure is specified in accordance with the data definition information; and a functional unit 15a for gaining access to the real data of the map DB 10dby executing the data access program while determining the storage locations of the real data by referring to the data management data. |
