1. An image processing apparatus comprising: unconscious expression parameter storing means for storing a parameter specifying a facial expression that unconsciously appears in a steady state as an unconscious expression parameter; conscious expression parameter storing means for storing a parameter specifying a facial expression that is consciously expressed from the steady state as a conscious expression parameter; mixing means for generating face model data by mixing the unconscious expression parameter and the conscious expression parameter; and rendering means for rendering a facial expression on the basis of the face model data.