To generate a natural face expression based on a not specific instruction without specifying a key frame one by one.

A retention section 311 of an unconscious face expression animation parameter retains the unconscious face expression animation parameter defining a face expression which unconsciously appears in a steady state. A retention section 312 of a conscious face expression animation parameter retains the conscious face expression animation parameter defining a face expression which consciously appears in addition to the steady state. The above parameters are updated by an instruction from an application. By mixing the unconscious face expression animation parameter with the conscious face expression animation parameter, an animation mixing section 322 generates a face model data. Based on the above face model data, an image rendering section 342 renders a face indication.