We're building "face" interface which is a user-friendly human-machine interface with Multi-media and can realize face-to-face communication environment between an operator and a machine. In this system, human natural face appears on the display of machine and can talk to operator with natural voice. This paper describes face motion and expression synthesis schemes which can be applied to this "face" interface. We express a human head with 3D model. The surface model is built by texture mapping with 2D real image. All the motions and expressions are synthesized and controlled automatically by the movement of some feature points on the model. This "face" interface is one of the applications of model based image coding and media conversion schemes we've been studying.