A communication method for a novel network, wherein the novel network is a network with a centralized control function, which comprises a main control server and subordinate network devices, the subordinate network devices comprise terminals, and the method comprises: configuring, by the main control server, a downlink communication link of a current service; and transmitting a data packet of the current service, sent from a source terminal, to a target terminal via the downlink communication link; characterized in that the novel network comprises an access network, the main control server is a node server and the subordinate network devices comprise an access switch and terminals in the access network, the service comprises a unicast communication service, and the configuring by the main control server the downlink communication link of the current service comprises: acquiring, by the main control server, information on the downlink communication link of the current service according to a service request protocol packet initiated by the source terminal, wherein the information on the downlink communication link comprises downlink communication port information of the main control server and an access switch that participate in the current service; setting, by the main control server, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table according to the downlink communication port information of the main control server, and sending a port configuration command to the corresponding access switch according to the downlink communication port information of the access switch; and setting, by the access switch, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table in response to the port configuration command. configuring, by the main control server, a downlink communication link of a current service; and transmitting a data packet of the current service, sent from a source terminal, to a target terminal via the downlink communication link; characterized in that the novel network comprises an access network, the main control server is a node server and the subordinate network devices comprise an access switch and terminals in the access network, the service comprises a unicast communication service, and the configuring by the main control server the downlink communication link of the current service comprises: acquiring, by the main control server, information on the downlink communication link of the current service according to a service request protocol packet initiated by the source terminal, wherein the information on the downlink communication link comprises downlink communication port information of the main control server and an access switch that participate in the current service; setting, by the main control server, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table according to the downlink communication port information of the main control server, and sending a port configuration command to the corresponding access switch according to the downlink communication port information of the access switch; and setting, by the access switch, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table in response to the port configuration command. acquiring, by the main control server, information on the downlink communication link of the current service according to a service request protocol packet initiated by the source terminal, wherein the information on the downlink communication link comprises downlink communication port information of the main control server and an access switch that participate in the current service; setting, by the main control server, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table according to the downlink communication port information of the main control server, and sending a port configuration command to the corresponding access switch according to the downlink communication port information of the access switch; and setting, by the access switch, a downlink port to which the data packet of the current service is to be oriented in its internal data packet address table in response to the port configuration command.