To provide a navigation apparatus capable of providing a traffic obstruction section and its detour even if a guidance is off.

In the automobile navigation system, the traveling state of own vehicle is monitored even if the guidance is off, and a recommended route indicated by a dashed line 103 from a current position (an own vehicle position mark 101) to a destination is searched even if one deviates from the recommended route. Then, in the automobile navigation system, traffic information is searched, the traffic obstruction section 104 is displayed on a road map screen 100c when traffic obstruction occurs in the new recommended route, a "detailed information" display button 105 is displayed, and detailed information regarding the traffic obstruction section 104 is provided when the "detailed information" display button 105 is selected. Additionally, a "detour" display button 106 is displayed, a route for detouring the traffic obstruction section 104 is searched when the "detour" display button 106 is selected, and the route is displayed on the road map screen for providing to a user.