A method and a device for generating a CID for D2D communication are provided. A transmitting device transmits a request for direct communication between the transmitting device and a receiving device on a resource unit of a first resource index determined based upon at least one of a device ID of the transmitting device or of the receiving device during a first period, receives information about at least one used CID being used by at least one surrounding device from the peripheral device during a second period, transmits information including at least one available CID acquired during the second period on a resource unit of a second resource index being identical to the first resource index during a third period, and determines at least one CID to be used for D2D communication between the transmitting device and the receiving device based on the transmitted information.