To provide animation technique capable of automatically generating an animation automatically including a mouth part according to voice data, etc.

Voice data are received and a phoneme analysis is taken to generate phoneme events along a time base (31). A mouth-shape animation corresponding to one or more phonemes is weighted and added to generate an animation of a distinctive or vague mouth shape corresponding to an articulate or obscure phoneme (32). For a phoneme whose mouth movement is earlier than pronunciation, the phoneme event is made earlier than voice data timing.