A user terminal device has a computer, a software for the user terminal device, a telephone, a video camera and a virtual office display device. Generally, working state, condition or the like of another user is displayed on a screen of the virtual office display device. A user's state is recognized...http://www.google.es/patents/US7116284?utm_source=gb-gplus-sharePatente US7116284 - Control apparatus of virtual common space using communication line
Control apparatus of virtual common space using communication line
