FIGS. 3B and 3C show examples of the display obtained when the HDTV signal is displayed on the NTSC monitor in a case where the image size in the vertical direction is reduced unlike the case of FIG. 3A to display the entire portion of the image in the horizontal direction so as to compensate for the difference in the height/width ratio (FIG. 3B) and in a case where both side portions of the image