The invention discloses a cluster communication method and system, user equipment and network side equipment and relates to the wireless communication technology. The method includes when cluster user equipment (UE) is interested in receiving a cluster service loaded by multimedia broadcast multicast service (MBMS) or receives the same, if the cluster UE judges that the cluster service is loaded and transmitted through unicast, transmitting a unicast cluster service loading and transmitting request to a cluster application server (AS); when the AS receives the request of the cluster UE and establishes the unicast loading with the cluster UE, allowing the cluster UE to receive cluster data through the unicast loading and to stop receiving cluster data loaded by the MBMS. The invention further provides the user equipment, the network side equipment and the cluster communication system. By the aid of the technical scheme, the unicast transmission of cluster communication can be implemented, the continuity of the cluster communication service can be guaranteed, and the influence on wireless network access is reduced.