FIG. 9 illustrates another modified example of FIG. 8. In this example, a picture image 41 to be added to be displayed at the behavior display area 35a includes only a portion of a vehicle body, that is, a front end portion of a hood viewing from a driver's seat side. According to the above, the taken scenery 39 to be displayed at the behavior display area 35a of the monitor device 24 can be displayed as an enlarged region. Similarly, the picture image 41 is previously prepared and stored in the display information storing unit 6. In this case as well, since the travel direction and the travel course of the own vehicle is easy to be recognized in a visual manner, the symbol image 37′ may be eliminated.