Operation of the terminal method in a wireless communication system using a plurality of uplink frequency

PURPOSE: A method for operating a mobile station in a wireless communication system using a plurality of uplink frequencies is provided to efficiently use wireless resources. CONSTITUTION: UE(User Equipment) receives an inactivation command of a specific frequency from a base station(S710). UE successfully perform the decoding of an HS-SCCH(High Speed-Shared Control Channel) order, and determines that a secondary UL(UpLink) frequency is inactivated if an indicator which informs the inactivation of the secondary UL frequency exists in the HS-SCCH order. The UE initiates an HARQ(Hybrid Automatic Repeat request) process buffer related to the specific frequency(S720).