| 摘要 |
PROBLEM TO BE SOLVED: To provide proper information according to a request of a user, and to reduce the cost for system construction and system operation. SOLUTION: When transmitting a retrieval request to an information center 2 from a vehicular display device 1, a retrieval processing part 53 forms a retrieval result by retrieving a providing information database of a providing information database group storage part 43 with a menu and a menu item included in the retrieval request as a retrieving key, acquires the menu included in the retrieval request, a related menu and a related menu item related to the menu item by referring to a related information retrieving table, acquires related information by retrieving the providing information database with the acquired related menu and the related menu item as the retrieving key, and transmits the retrieval result and the related information to the vehicular display device 1. |
