To accurately set a start point on any road to search a route, even when expressways and general roads exist in the vicinity of the current position.

In this navigation system, the start point for the route search is set on the road of the kind similar to that of the road it has traveled the last, and is nearest to the current position, when route search is conducted. The start point for the route search may be set on the road which is identical to the road traveled last.