Since the taken scenery 39 is displayed at the monitor device 24 being the second display device 4 as a background image, it is possible to additionally display, with relative ease, modifications and image processing that are difficult to be performed on actual scenery serving as a background image, and a variety of image displaying as well as symbol images indicating the travel courses, the stop line marks, and the like for the prior notice displaying, virtual images of the own vehicle, and rear view of following vehicles. For example, it is possible that a road surface of an aimed lane for lane change or parking/stopping is displayed in a color different from surroundings or is emphasized by being lighted or blinked, that an outline shape of an invisible obstacle behind a building is additionally displayed, and that a three-dimensional frame such as a box shape is displayed at a parking/stopping space as being superimposed.