A communication control system includes a control server for controlling a process rule held in a forwarding node. The control server includes a network information storage unit for storing a logical network identifier which is an identifier of a logical network defined by setting of the forwarding node, and a correspondence relation between a device connected to the forwarding node and the logical network; and an address resolution unit for, upon receiving from the forwarding node an address resolution request for a destination communication device which is a destination of the packet or a communication device for forwarding the packet received from a source communication device which is a source of the packet to another device, performing interlayer address resolution for the destination communication device or the communication device, and setting the logical network identifier of the logical network to which the source communication device belongs.