The present invention provides a method for supporting mobility of selected IP traffic offload (SIPTO) by a server undertaking a control plane in a mobile communication network. The method can comprise the following steps: receiving a handover request message for a terminal receiving a SIPTO service by means of a source base station to a target base station; deciding whether to deactivate the SIPTO service; performing a process for disconnecting a public data network connection (PDN) for the SIPTO, based on the decision; and transmitting to the terminal via the source base station a message including information for reactivating the SIPTO after the handover, according to the decision.