Abstract: A multi-cast ABR service system comprises a switch for broadcasting a Forward RM cell sent from a sending terminal, multiplexing Backward RM cells sent from receiving terminals so to send the same to the sending terminal, and turning back a Forward RM cell so as to be returned to the sending terminal, an ER table for storing receiving capable rates mounted on the Backward RM cells sent from the switch, and an FRM/BRM converting unit for receiving the Forward RM cell returned from the switch, converting the same Forward RM cell into a Backward RM cell destined to the sending terminal, and sending the Backward RM cell with the receiving capable rate stored in the ER table mounted thereon to the sending terminal.