1. An image display system for stereoscopic viewing a stereoscopic image, comprising: a real image presentation unit configured to show a first view image of the stereoscopic image as a real image; and a virtual image presentation unit configured to show a second view image of the stereoscopic image as a virtual image, wherein the first view image is viewable by one eye of a viewing person, and the second view image is viewable by the other eye of the viewing person, which the first view image and the second view image together form the stereoscopic image, the virtual image presentation unit includes an image pick-up unit that is configured to take an image of a code image that indicates an address of the second view image, and the virtual image presentation unit is configured to show the second view image, serving as the virtual image, stored at the address indicated by the code image photographed by the image pick-up unit.