A Device-to-Device, D2D, broadcast communication method, comprising: performing, by a source D2D User Equipment, UE, of mobile communication network, D2D broadcast communication outside a network coverage area of said mobile communication network in a centralised manner and broadcasting data on a shared channel via a central node, wherein at least one of a source D2D User Equipment, UE, the central node, or a destination D2D UE is located outside the network coverage area of said mobile communication network; wherein performing D2D broadcast communication outside said network coverage area in the centralised manner and broadcasting the data on the shared channel via the central node comprises: if the source D2D UE discovers that there is a central node, sending, by the source D2D UE, a request message to the central node; if the central node determines that the request message is accepted, receiving, by the source D2D UE, an acceptance response message sent by the central node, and sending, by the source D2D UE, data required to be broadcast to the central node such that the central node broadcasts the data on the shared channel; and if the central node determines that the request message is not accepted, receiving, by the source D2D UE, a refusal response message sent by the central node, wherein the shared channel is a pre-set radio resource; and the pre-set radio resource is an uplink resource of said mobile communication network, which comprises at least one of: a frequency, a frame or sub-frame, a repetition period, or a resource index. performing, by a source D2D User Equipment, UE, of mobile communication network, D2D broadcast communication outside a network coverage area of said mobile communication network in a centralised manner and broadcasting data on a shared channel via a central node, wherein at least one of a source D2D User Equipment, UE, the central node, or a destination D2D UE is located outside the network coverage area of said mobile communication network; wherein performing D2D broadcast communication outside said network coverage area in the centralised manner and broadcasting the data on the shared channel via the central node comprises: if the source D2D UE discovers that there is a central node, sending, by the source D2D UE, a request message to the central node; if the central node determines that the request message is accepted, receiving, by the source D2D UE, an acceptance response message sent by the central node, and sending, by the source D2D UE, data required to be broadcast to the central node such that the central node broadcasts the data on the shared channel; and if the central node determines that the request message is not accepted, receiving, by the source D2D UE, a refusal response message sent by the central node, if the source D2D UE discovers that there is a central node, sending, by the source D2D UE, a request message to the central node; if the central node determines that the request message is accepted, receiving, by the source D2D UE, an acceptance response message sent by the central node, and sending, by the source D2D UE, data required to be broadcast to the central node such that the central node broadcasts the data on the shared channel; and if the central node determines that the request message is not accepted, receiving, by the source D2D UE, a refusal response message sent by the central node, wherein the shared channel is a pre-set radio resource; and the pre-set radio resource is an uplink resource of said mobile communication network, which comprises at least one of: a frequency, a frame or sub-frame, a repetition period, or a resource index.