According to an aspect of the present disclosure, a control method of a user equipment (UE) in a wireless communication system is provided. The method includes receiving packet data convergence protocol (PDCP) configuration information including information indicative of whether a PDCP layer supports out-of-sequence delivery, identifying whether the PDCP layer supports out-of-sequence delivery based on the PDCP configuration information, and processing a PDCP protocol data unit (PDU) based on a result of identifying whether the PDCP layer supports out-of-sequence delivery. In accordance with another aspect of the present disclosure, a UE in a wireless communication system is provided. The UE includes a transceiver configured to transmit/receive a signal and a controller configured to control the transceiver to receive packet data convergence protocol (PDCP) configuration information including information indicative of whether a PDCP layer supports out-of-sequence delivery and to control to identify whether the PDCP layer supports out-of-sequence delivery based on the PDCP configuration information and process a PDCP protocol data unit (PDU) based on a result of identify whether the PDCP layer supports out-of-sequence delivery.