System and method for data transmission in wireless lan

The present invention provides a system and a method for effective data communication with a terminal in an area where wireless LAN APs are densely populated. Specifically, the present invention relates to a system and a method for data transmission in a wireless LAN, in which detour route service and rescheduling are performed by detecting service failures, quality failures, link failures, etc. The system for data transmission in the wireless LAN comprises a first wireless LAN terminal and a first wireless LAN AP, wherein the first wireless LAN terminal requests permission for wireless access to the first wireless LAN AP after a predetermined waiting time in an idle state, and the first wireless LAN AP transmits, to the first wireless LAN terminal, a response regarding the permission for wireless access.