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 screen of the monitor device 24 to the symbol image 79′ and a position where a leading end thereof reaches the symbol image 80′ while moving backward therefrom and performing lane change toward the road shoulder 71′. The symbol image 77′ indicating the planned parallel parking space may be displayed simply as an outline box shape. Here, to be easily recognizable on the screen of the monitor device 24 that is relatively small, the entire planned parallel parking space may be lightened or blinked.