| 摘要 |
The present invention provides, in a car navigation system, a unit of notifying a user of the update contents of map data prior to the downloading of the map data. A vehicle-mounted terminal (2) sets a difference update area in accordance with a selection made by a user (S1202) and sends a difference update request to a map updating server (S1203). If an update mode in this case is "update after outline display" (Yes in S1207), the vehicle-mounted terminal (2) downloads an outline update map from the map updating server (S1208). The outline update map is displayed on a display unit (31) of a display (S1209). Here, when a download start button displayed on the display unit (31) is depressed (Yes in S1210), the vehicle-mounted terminal (2) downloads a detailed update map from the map updating server (S1212). The detailed update map is then displayed on the display unit (31) of the display (S1213)). Furthermore, an updating process is performed on the map data stored in a terminal DB (S1214). |
