Patent ID: 8285472

Claim:
A navigation apparatus for displaying a guiding route on an image display apparatus, the apparatus comprising: a routing unit for determining the guiding route using route cost calculation; a traffic event acquisition unit for sequentially acquiring a traffic event on a road; a traffic event display control unit for controlling the image display apparatus so as to display a traffic event image representing a traffic event acquired by the traffic event acquisition unit near a road containing the traffic event on a map image in a normal representation mode assigned to the traffic event image; and a determination unit for building a cost for a traffic event acquired by the traffic event acquisition unit into the route cost calculation and determining possibility of changing a guiding route based on a result of the route cost calculation, wherein the traffic event display control unit controls the image display apparatus based on an affirmative determination of the determination unit so as to display simultaneously on the map image: (i) a post-change guiding route, (ii) a pre-change guiding route, and (iii) a traffic event image corresponding to a traffic event on the pre-change guiding route causing the affirmative determination near a road containing the traffic event on the map image, in a first another representation mode of the traffic event image different from the normal representation mode assigned to the traffic event image.