The first stop line mark indicated by the symbol image 79 indicates a planned front end position when the own vehicle stops for heading-back for parallel parking. The second stop line mark indicated by the symbol image 80 indicates a planned rear end position when the own vehicle moves backward and stops on the planned parallel parking space. The arrow mark being the symbol image 78 indicating the travel course includes a first portion extending approximately straightly from a position just in front of the front windshield 15 to the symbol image 79 and a second portion extending therefrom in an opposite direction to a position where a leading end thereof reaches the symbol image 80 while performing lane change toward the road shoulder 71. Similarly to the above, the symbol image 77 indicating the planned parallel parking space may be displayed simply as an outline box shape.