A method for operating a serving cell by a user equipment (UE) in a wireless communication system is disclosed. Specifically, the method comprises the steps of: forming a plurality of secondary cells (SCells), as one group, corresponding to a same frequency band through an upper layer; setting an enabled first SCell among the plurality of SCells as the serving cell and transmitting and receiving signals with a network; receiving a serving cell configuration message from the network to disable the first Scell and enable a second SCell; and setting the enabled second SCell as the serving cell and transmitting and receiving signals with the network.