1. A car navigation system comprising: a current position detecting section for detecting a current position of a vehicle; a map information storing section for storing map information; a route storing section for storing a route from the current position to a destination, the current position being searched for and set based on said map information storing section; a guidance node storing section for storing a guidance node extracted from the route stored; a guidance section for providing guidance of one of the route and guidance node; a control section for controlling said sections; and a trifurcate guidance section for making a decision of considering two consecutive bifurcate intersections as a single trifurcate guidance node, for making a decision of a guidance direction to be provided as trifurcate guidance, and for having said guidance section provide the trifurcate guidance as to the single trifurcate guidance node.