The present invention relates to a method for allowing a station (STA) operable in a plurality of frequency bands to perform a fast session transfer (FST) to a white space band in a wireless local area network (WLAN), and a station device therefore. When an FST is performed, if a band to which mobility is desired through the FST is a white space band, a multi-band element transmitted in an FST request message is suggested to additionally include particular white space information for available channel information acquisition, which is not used by a licensed user in the white space band. Said particular white space information may contain information that indicates whether a target channel is an available channel, and/or performance (apparatus type) in a white space band of a station that requests an FST.