1. A stereoscopic image output system for stereoscopic vision of an image, comprising: a stereoscopic vision output unit for realizing stereoscopic vision by outputting an image for the left eye and an image for the right eye with parallax so that the images can be visually recognized by the left eye and the right eye, respectively; an image database storage unit for storing parallel projection data for the left eye and parallel projection data for the right eye as two-dimensional drawing data obtained by projecting a three-dimensional model to be a target of stereoscopic vision on a plane by parallel projection from diagonal directions inclined from a vertical direction by predetermined projection angles respectively set so as to generate parallax between the left and right eyes; and an output control unit for outputting the image for the left eye and the image for the right eye with parallax for outputting an image in a specified output range to the stereoscopic vision output unit on the basis of the parallel projection data for the left eye and the parallel projection data for the right eye, wherein if the output range moves, the output control unit determines moving directions of the image for the left eye and the image for the right eye individually, reads the parallel projection data for the left eye and the parallel projection data for the right eye in accordance with the moving directions and outputs the image for the left eye and the image for the right eye.