A method, performed by a first user equipment (UE), of performing unicast communication includes transmitting a direct communication request message, generating a profile for a PC5 unicast link, receiving, from a second UE, a response message based on a result of establishment of the PC5 unicast link; and transmitting, to the second UE, a data message over the PC5 unicast link based on the response message, wherein the profile includes at least one of a Layer-2 identifier (ID) of the first UE, an application layer ID of the first UE, a Layer-2 ID of the second UE, an application layer ID of the second UE, PC5 5th generation (5G) Quality of Service (QoS) Indicator (PQI), or PC5 QoS Flow identifier (PFI) associated with the PQI.