A drive support display device supporting a drive of a self-vehicle based on a detection result by an object detector regarding a nearby area of the self-vehicle. The device receives object information from an external source, the object information identifying a nearby object existing in the nearby area of the self-vehicle, determines whether the nearby object is detected by the object detector, and provides a warning indicator when the determination section determines that the nearby object is an undetected nearby object that is not detected by the object detector. As a result, the undetected nearby object, which is already identified as existing somewhere nearby the self-vehicle but is invisible therefrom, may be emphasized in an image provided by the drive support display device.