A touch-panel is display overlays which have the ability to display and receive information on the same screen. The advantage of this touch screen is that it is easy for all users to operate intuitively. In addition, a touch-panel interface is utilizable for multi-users. However a conventional system cannot provide us with direct touching in the air because the touching point differs from the actual displaying space. The reason is that a conventional touch-panel system detects the user's operation on the display screen. In the virtual 3D space, it is important to realize that the user can operate at the same space. The authors developed a prototype virtual air touch interface system for interaction in the virtual 3D space. In this paper, we propose the interface system using a theremin which is a musical instrument having the unusual aspect of being controlled by the performer's hand motions near the antennas.
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