To enable a user to view a photograph of parents in life and a marriage commemorative photograph or the like stuck to an album as a stereoscopic image under conditions that a three-dimensional television and a three-dimensional film may become very popular at present.

A collection of commemorative photographs is formed by sticking many stereoscopic two-image printed photographs taken by a twin lens stereo-camera to a home album. On a subsequent day, when the user wants to see a certain photograph as the stereoscopic image especially when seeing the photographs in the album, if the user sees the photograph through a "prism stereoscope" as if he/she saw it through a magnifying glass, two right and left images can be viewed only as one image in the center to view the stereoscopic image of the photograph by the refraction with a prism.