Method and apparatus for mac in a wireless lan

PURPOSE: A method and an apparatus for performing a medium access control of a wireless LAN are provided to improve QoS by using a prior queue in a medium access control process. CONSTITUTION: A medium access control processor(1) assigns data to a prior queue according to kinds of data when the medium access control processor transmits an MPDU to a physical layer(5). The medium access control processor assigns the data to the prior queue according to a predetermined order corresponding to a predetermined service parameter value when the medium access control processor receives the MPDU from the physical layer. The prior queue includes a control queue for storing ACK frames and burst transmission frames of segmented frames, an A/V stream queue for processing packets of audio/video stream, and a data queue for processing a file transmission process and a data transmission process.