| 摘要 |
Identifying a position of a vehicle using an absolute position coordinate based on radio navigation and a relative position coordinate based on at least vehicle speed. Setting, for traveling history information, reference sections in which a traveling area is common, and reading two absolute position coordinates concerning a same vehicle that are transmitted at different points in the reference section. Calculating distances between the two absolute position coordinates. A first distance is calculated based on the road map information. A second distance is calculated based on the vehicle speed included in the traveling history information. Selectively performing, according to an absolute value of a difference between the first and second distances, one of identification of the position using the absolute position coordinate, identification of the position using a vehicle speed integrated value, and identification of the position using both of the absolute position coordinate and the vehicle speed integrated value. |
