A recognizing unit recognizes targets located in front of the own vehicle based upon a detection result obtained from a preview sensor, and then, classifies the recognized targets by sorts to which these targets belong. A control unit determines information to be displayed based upon both the targets recognized by the recognizing unit and navigation information. A display device is controlled by the control unit so as to display thereon the determined information. The control unit controls the display device so that symbols indicative of the recognized targets are displayed to be superimposed on the navigation information, and also, controls the display device so that the symbols are displayed by employing a plurality of different display colors corresponding to the sorts to which the respective targets belong.