The embodiments of the present disclosure disclose a Device to Device communication method and system based on network sharing, and a storage medium. The method includes that: Device to Device User Equipment D2D UE receives at least one of the following information sent by a network through a broadcast message or a dedicated message: a list of different Public Land Mobile Networks PLMNs supporting D2D, resource pool information for D2D discovery and/or D2D communication of different PLMNs, and a PLMN list corresponding to the resource pool information for D2D discovery and/or D2D communication; and a resource range used for D2D discovery and/or D2D communication is determined by virtue of the resource pool information or the resource pool information corresponding to the PLMN list.