Wireless LAN System and method of using the same

PURPOSE: A wireless LAN system and a using method thereof are provided to detect whether a channel set by a currently used wireless LAN system has a propagation interference with a used channel of other wireless LAN system, and to properly control the channel, thereby preventing cross talk and interference. CONSTITUTION: An ISCC(Inter-Space Channel Coordinator)-AP(Access Point)(510) has an ISCC function except a basic AP function. Through the ISCC function, a propagation interference caused between adjacent wireless LAN systems is detected, and a current channel is controlled to a channel without the propagation interference. An ISCM(Inter Stage Connection Module) device 1A(530), an ISCM device 1B(550), and an ISCM device 1C(570) scan a channel state used in a wireless LAN system located in a peripheral area, and inform the ISCC-AP(510) of related channel information.