1. An avatar facial expression representation apparatus, comprising: a vocal information processor to output vocal information including at least one of an emotional change of a user and a point of emphasis of the user from vocal information generated by the voice of the user; a pronunciation information processor to output pronunciation information including a change in mouth shape of the user from pronunciation information generated by the voice of the user; an image information processor to output facial information by tracking facial movements and changes in facial expression of the user from image information; and a facial expression processor to represent a facial expression of an avatar using at least one of the vocal information output from the vocal information processor, the pronunciation information output from the pronunciation information processor, and the facial information output from the image information processor.