A communication system, comprising: at least one forwarding node (210, 220, 230), arranged between mobile backhauls, processing a received packet in accordance with a process rule in which a matching rule for identifying a flow and a process content applied to a packet coinciding with the matching rule are associated with each other; and a control apparatus comprising: a path calculation unit for calculating a packet forwarding path for each flow between a source and destination address; a forwarding control policy management unit (15, 17, 23) for managing a packet forwarding control policy applied to the at least one forwarding node; and a storage unit (14, 20, 21, 22) for storing information about the at least one forwarding node (210, 220, 230), the information including at least forwarding control policy information (POLICY#) associated with the at least one forwarding node (210, 220, 230), the forward control policy information containing flow identifiers (FLOW#), the flow identifiers assigned to flows dependent on the source or the destination address, wherein the control apparatus is configured to set process rules that set a priority of packets to be transmitted using the flow identifiers (FLOW#) in the at least one forwarding node (210, 220, 230) reflecting the contents of the forwarding control policy information for the forwarding nodes (210, 220, 230) in the packet forwarding path calculated by the path calculation unit; and wherein the flow identifiers (FLOW#) represent a degree of priority, based on the source or destination address, that is common between different mobile backhauls. at least one forwarding node (210, 220, 230), arranged between mobile backhauls, processing a received packet in accordance with a process rule in which a matching rule for identifying a flow and a process content applied to a packet coinciding with the matching rule are associated with each other; and a control apparatus comprising: a path calculation unit for calculating a packet forwarding path for each flow between a source and destination address; a forwarding control policy management unit (15, 17, 23) for managing a packet forwarding control policy applied to the at least one forwarding node; and a storage unit (14, 20, 21, 22) for storing information about the at least one forwarding node (210, 220, 230), the information including at least forwarding control policy information (POLICY#) associated with the at least one forwarding node (210, 220, 230), the forward control policy information containing flow identifiers (FLOW#), the flow identifiers assigned to flows dependent on the source or the destination address, a path calculation unit for calculating a packet forwarding path for each flow between a source and destination address; a forwarding control policy management unit (15, 17, 23) for managing a packet forwarding control policy applied to the at least one forwarding node; and a storage unit (14, 20, 21, 22) for storing information about the at least one forwarding node (210, 220, 230), the information including at least forwarding control policy information (POLICY#) associated with the at least one forwarding node (210, 220, 230), the forward control policy information containing flow identifiers (FLOW#), the flow identifiers assigned to flows dependent on the source or the destination address, wherein the control apparatus is configured to set process rules that set a priority of packets to be transmitted using the flow identifiers (FLOW#) in the at least one forwarding node (210, 220, 230) reflecting the contents of the forwarding control policy information for the forwarding nodes (210, 220, 230) in the packet forwarding path calculated by the path calculation unit; and wherein the flow identifiers (FLOW#) represent a degree of priority, based on the source or destination address, that is common between different mobile backhauls.