A video processing device includes a receiver that successively receives input images, each having a prescribed overlapping image superimposed in one or more areas thereof, a compositing image generation unit that successively generates compositing images based on the external information, a video compositing unit that successively generates composite images, a compositing abnormality detection unit that determines whether one or more areas of the composite image have abnormality or not, a comparison unit that compares the one or more areas of the input image with those of the composite image to determine whether or not the respective areas match, if it is determined that the composite image have no abnormalities, and an output control unit that outputs the input image if it is determined that the respective areas match, and outputs the composite image when it is determined that the respective areas do not match.