The purpose of our work is to develop an instruction system for billiards for beginners using a projector-camera system. The direction and strength of shot are quite important in or- der to make the shot successful. The player's shooting stance is also important to shoot the cue-ball exactly. The direction and strength of shot and the proper shooting stanceare non-symbolic information which is difficult to send to the beginner. It is generally useful that the beginner easily ets these kinds of information. We use a projector to re- solve this problem. In this paper, we describe the method recognizing objects on the table, the method calculating a shooting path and shot difficulty, and the method showing the supporting information. We have confirmed experimental effectiveness of our support information.