The arrow mark being the symbol image 83′ 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 84′ and a second portion extending therefrom in an opposite direction to a position where a leading end thereof reaches the parking space 82′ while changing orientation thereof toward a road side of the road 70′ by 90 degrees. Since the screen of the monitor device 4 is relatively small, it is preferable to add, for example, an outline box shape to make the position of the parking space 82′ be easily recognizable for the occupant. Further, the position may be displayed as being lighted or blinked.