A multimedia communication system having at least one terminals capable of multimedia communication, a user information storage for storing the information on the users of the terminals, a terminal information storage for storing the information on the terminals and a media information storage for storing the occupied/unoccupied status of one or more communication media capable of being used at the terminals, wherein the occupied/unoccupied status of all the communication media for a designated user are read from the media information storage, the dynamic situation of the user is read from the user information storage, and the occupied/unoccupied status thus read is changed in accordance with one or more rules including the conditions for the dynamic situation and the contents of change in the occupied/unoccupied status.