The present invention relates to a scheduling system and method to ensure an equal opportunity to speak to the partner in the conference call system using a (Push To Talk) PTT. The invention above and multipoint conference server that provides multimedia conference according to the scheduling device, speech requestor and the first speech priority participants mutually set priority first remark priority updates the priorities of all the conference participants in accordance with having, under the control of the multipoint conference server includes a database for registering a participant registration information of all the participants who participated in the multi-party conference. ; PTT, conference call, voice, priorities, conferences
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