A 3D video processor that outputs a left-eye image and a right-eye image to be superimposed on main video includes: a left-eye object processing unit that outputs the left-eye image; a right-eye object processing unit that outputs the right-eye image; and an image output control unit that controls the left-eye object processing unit and the right-eye object processing unit so that the left-eye image and the right-eye image are synchronously outputted. The left-eye object processing unit determines whether or not image output preparation of the left-eye image is completed. The right-eye object processing unit determines whether or not image output preparation of the right-eye image is completed. The image output control unit instructs to skip the output of both the left-eye image and the right-eye image, when the image output preparation of one of the left-eye image and the right-eye image is not completed.