1. A method for generating a mouth shape library, comprising the steps of: providing speaker-independent mouth shape model information organized by context; providing speaker-dependent mouth shape model information based on at least one training speaker; obtaining mouth shape data for a new speaker; estimating context-independent mouth shape model information based on said mouth shape data for said new speaker and said speaker-dependent mouth shape model information; identifying context-dependent mouth shape model information based on said speaker-independent mouth shape model information; and constructing the mouth shape library by combining said context-independent and said context-dependent information.