A method, performed by a terminal, in a wireless communication system is provided. The method includes receiving, from a source base station, a radio resource control (RRC) reconfiguration message including data radio bearer (DRB) configuration information, wherein the DRB configuration information includes an identifier of a DRB and an indicator for a dual active protocol stack (DAPS) handover, and in case that the DRB configuration information includes service data adaptation protocol (SDAP) configuration information, and completion of a random access to a target base station is indicated by a target medium access control (MAC) entity for the target base station, reconfiguring a SDAP entity based on the SDAP configuration information.