In this paper, we propose the multi-point position measurement using a photo array and infrared LED which can be applied to three-dimensional user interface. In recent years, the digital terminal which manages and operates information is tended to multiply functions. Thus, the handleability of its interface decline relatively, and it is necessary to become skilled in operation. Accordingly, a touch panel which enables sensuous operation became widely used. These lead to the situation where user cannot make full use of function and the digital divide. Because an input and an output of a touch panel are seamless, the operation with the gesture input realizes a direct and intuitive interaction and improves the operability of digital terminal. An improvement in the handleability by an intuitive operation depended on the flexibility of the interface. Therefore, an improvement of the handleability is expected by expanding an input range from two-dimensions to three-dimensions.
