A navigation apparatus acquires a traffic event and accordingly determines whether or not to change a guiding route to a destination. Based on an affirmative determination, the navigation apparatus displays icons corresponding to traffic events causing the affirmative determination near a road containing the traffic event in a map image in a representation mode for an image of the traffic event different from a normal representation mode assigned to the traffic event. In this manner, the navigation apparatus changes the guiding route to the destination dynamically depending on information about traffic events on roads and allows a user to recognize a cause of changing the guiding route.