An indication control unit 11 indicates a side-rearward image of a vehicle 1 captured by a left-rearward camera 2L and a right-rearward camera 2R mounted on the vehicle 1, after superimposing guidelines showing a guide of a distance from the vehicle 1, to a left-rearward indicator 3L and a right-rearward indicator 3R. A road shape recognizing unit 13 recognizes a shape of a road on which the vehicle is traveling. When it is recognized by the road shape recognizing unit 13 that the vehicle 1 is traveling on the road of a predetermined shape, the indication control unit 11 sets the guidelines to non-display, or sets an indicating position of the guidelines according to the shape of the road recognized by the road shape recognizing unit 13.