Stations grouping for efficient multicasting

The present invention relates to a terminal grouping method in a multiple transmission environment of a TDMA/MU-MIMO system, capable of maintaining fairness between receivers with a high level and increasing the efficiency of downlink frame multicasting in a multicasting-based MU-MIMO wireless WLAN environment by grouping multicasting receivers according to channel quality, controlling transmission power according to a stream, and using a proper MCS at each different subgroup.