A device comprises: a rear video data acquiring unit 42 configured to acquire first video data from a rear camera that is arranged on a rear part of the vehicle and configured to image a rear side of the vehicle; a clipping unit 50 configured to clip a first area that is a part of the first video data acquired by the rear video data acquiring unit 42; a detecting unit 70 configured to perform moving object recognition and detect presence of a rear moving object in the first video data; and a display control unit 90 configured to display video clipped as the first area on a rearview monitor 140 that displays rear video of the vehicle, and display video clearly indicating presence of a detected rear moving object if the detecting unit 70 detects presence of the rear moving object.