Provided is an operating method of a user equipment (UE) in a wireless communication system, the operating method including: receiving, from a base station, a radio resource control (RRC) message including packet data convergence protocol (PDCP) layer configuration information for each data radio bearer (DRB); and when a PDCP entity is configured to be reestablished for each DRB and the PDCP layer configuration information includes an indicator indicating to continuously use header compression protocol configuration information, indicating to a lower layer entity that the header compression protocol configuration information is configured to be continuously used.