Focusing on an infrared camera and a near-infrared radar, we have developed a system for new amusements which we can operate by gesture input toward a screen or moving our bodies in front of a screen projected on a wall. The infrared camera is used for operations performed by means of gestures, and the near-infrared radar is used for operations performed by larger movement of a human body by detecting the position of the person or the state of his feet near the floor surface. A screen is projected on a wall by an ultra-short throw projector. This system can be set up anywhere if there is a certain sized wall.