The present invention discloses a multi-user conferencing system, where the multi-user conferencing system includes an infrared device and a cloud server, where the infrared device having no display screen is communicatively connected to the cloud server and creates a conference; the infrared device determines, according to a distribution situation of infrared rays blocked by a writing object operated by a user in the conference, coordinate information of the writing object, and sends the coordinate information to the cloud server; and a terminal participating in the conference acquires data from the cloud server, and reproduces writing content during the conference. A multi-user conferencing system in embodiments of the present invention may save data traffic generated by a conference, and enhance data processing speed.