Ultra realistic communications are expected to realize a new communication method which will connect among different sites. In this situation, it will become more important to communicate with one another via a virtual environment which is generated by virtual reality technique on the computer network. In order to help an operator work various things in virtual space smoothly, we hope to realize much more convenient human interface in virtual space rather than real space. Therefore, we are studying on various methods by which computer can understand human's intention and realize a higher support to various works.