1. A texture information assignment method for a shape model, comprising the steps of: describing a shape of an object of interest as a shape model by a set of a plurality of three-dimensional shape constituent elements; and assigning texture information for said shape model to each said three-dimensional shape constituent element on the basis of a plurality of object image information captured by shooting said object of interest from different viewpoints, according to a texture information amount for said three-dimensional shape constituent element of said each object image information.