Wireless access point device and method for detecting unauthorized wireless lan node

Provided is a method for detecting unauthorized wireless LAN node, which comprises the steps of: checking a wireless LAN node which transmits the same Service Set ID (SSID) as the wireless access point device; transmitting an access request message to the wireless LAN node when the wireless LAN node transmitting the same SSID exists as a result of the checking; transmitting a predetermined test packet to the wireless LAN node when receiving a response message to the access request message from the wireless LAN node; determining whether or not a predetermined response message is received from the wireless LAN node in response to the transmission of the test packet; and determining the corresponding wireless LAN node to be an unauthorized wireless LAN node when the predetermined response message is not received as a result of the determination.