A teleconference system is large-scale. In the present invention, an IM server provides instant message service to a first client, a second client and a content providing device. The first client adds position information of a first cursor to an instant message and transmits the instant message to the content providing device. The content providing device transmits an instant message including the position information to the second client which displays the same content as the first client. The second client draws a third cursor at a position on the content specified by the position information. Accordingly, a conference or a meeting with a person at a remote location can be carried out by a relatively small system architecture.