Method for power management and terminal using same method in wireless lan system

According to an embodiment of the present disclosure, a method comprises the steps of: receiving, by an STA from an AP, a first beacon frame including a TWT parameter set for a TWT service interval and a TWT flow identifier indicating a permission group of an advisory frame transmitted by the STA in a TWT service interval; transitioning, by the STA, from an awake state to a sleep state after receipt of a first beacon frame; transitioning, by the STA, from the sleep state to the awake state on the basis of a TWT parameter set; determining, by the STA, whether or not a first UL frame for an AP is a recommendation frame on the basis of a TWT flow identifier; and determining, by the STA, whether the first UL frame is transmitted in the TWT service interval according to the determination result.