We propose new interaction techniques named "One-finger Interaction" in the ubiquitous environment in a home. One-finger Interaction is an interaction technique for doing various operations by moving the fingertip while pointed by the index finger. It is possible for the user to operate from a distant place. Moreover, because the user uses only a LED device and the recognition of the fingertip is robust, this method can be used easily in different environments. The user can also change the menu according to the preference and applications. Therefore, it is possible to use it in various environments. We developed two prototype interfaces for Onefinger Interaction. One is an interface to execute operations by moving the fingertip and crossing icons. The other is that the user selects a rough position of the menu by the direction of movement of fingertip, then selects a detailed position and decides the menu by the gesture which moves it like drawing circle. These interfaces all...