Abstract: In a stereoscopic image producing apparatus comprising an image displaying device, a memory device for storing celluloid image data with no display of an object to be composed, visual point position data indicating positional relationship between the object and a position of a visual point and background three-dimensional CG data to be composed, a CPU operates according to a program stored in a main memory device 100 to produce a stereoscopic image from two sets of composed image data as viewed from different visual points, each set of said data being produced by conducting the steps of calculating a visual point position of the object included in the celluloid image, determining position and size of a cylindrical model based on the result of the calculation, mapping the celluloid image to the cylindrical model and composing the mapped data with the three-dimensional CG data.