1. A shape deformation encoding device comprising: a calculation unit configured to calculate a difference data between a pre-deformation shape data which represents a shape of an object before shape change and a post-deformation shape data which represents a shape of an object after shape change; and a determination unit configured to determine an action area on which said shape change of said object is arisen and an external force which is acted to said action area for said shape change, based on said pre-deformation shape data and said difference data.