1. An image display system for stereoscopic viewing a stereoscopic image, comprising: a real image presentation unit for showing a first view image of the stereoscopic image as a real image; and a virtual image presentation unit for showing 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 first view image and second view image together form the stereoscopic image.