1. A method in which three-dimensional shape data of a plurality of people is obtained by measuring the body shape thereof, a multidimensional distribution map is formed based on said three-dimensional shape data of said plurality of people, and a virtual shape located on the periphery of the multidimensional distribution map is formed, whereby the virtual shape is generated, the method for generating the virtual shapes of the plurality of three-dimensional shapes being characterized in that: a space distortion function which mutually distorts said three-dimensional shape data of said plurality of people using the free form deformation method is computed; a multidimensional distribution map of said three-dimensional shape data of said plurality of people is generated; and a virtual shape existing at an arbitrary location of said multidimensional distribution map is derived.