The elapsed time of the proposed method is long than that of existing devices. However, users need to have one hand free to be use the trackball. Thus, users cannot use it when both hands are occupied. To use Wii remote, the users needs to move his/her head. This makes it inconvenient because of the lack of eyesight stability, and the situation where users is in crowds is danger. Moreover, moving the head feels strange. Also, this draws undesired attention to the user. On the other hand, the proposed method can be operated in various situations by switching the operating parts.