A method for supporting dual connectivity performed by a STA connected to a first AP and a second AP in a WLAN according to one embodiment includes: determining whether a predetermined AP change condition is satisfied while performing uplink transmission based on a first operating band for the first AP; transmitting an AP change request frame to the first AP in order to perform uplink transmission based on a second operating band for the second AP when it is determined that the AP change condition is satisfied; receiving an AP change response frame from the first AP in response to the AP change request frame; performing a channel switch operation from the first operating band to the second operating band when the AP change request frame is received; and transmitting an uplink frame to the second AP based on the second operating band.