COMPUTER-READABLE STORAGE MEDIUM HAVING STORED THEREIN DISPLAY CONTROL PROGRAM, DISPLAY CONTROL APPARATUS, DISPLAY CONTROL SYSTEM, AND DISPLAY CONTROL METHOD

An image display apparatus includes a stereoscopic image display apparatus configured to display a stereoscopically visible image, and a planar image display apparatus configured to display a planar image. An adjustment section of the image display apparatus adjusts relative positions, relative sizes, and relative rotations of a left-eye image taken by a left-eye image imaging section and a right-eye image taken by a right-eye image imaging section. The adjusted left-eye image and the adjusted right-eye image are viewed by the left eye and the right eye of the user, respectively, thereby displaying the stereoscopic image on the stereoscopic image display apparatus. The adjusted left-eye image and the adjusted right-eye image are made semi-transparent and superimposed one on the other, and thus a resulting superimposed planar image is displayed on the planar image display apparatus.