Disclosed are a selection and notification method and device for a layer 2 link identifier. The method comprises: in a notification solution, determining a layer 2 link identifier used by the device-to-device communication between a user equipment and every other user equipment; and broadcasting information carrying the layer 2 link identifier. In a selection solution, the user equipment receiving the information carrying the layer 2 link identifiers broadcast by the other user equipments; determining a used layer 2 link identifier group according to the layer 2 link identifier carried by the various information; and selecting a layer 2 link identifier other than the used layer 2 link identifier group as a layer 2 link identifier for the device-to-device communication between the current user equipment and each of other user equipments according to the used layer 2 link identifier group. The present invention can ensure the uniqueness of layer 2 link identifiers used in the device-to-device communication betw
