A communication control apparatus according to the present invention is connected between a core node which processes received packets in accordance with a specified flow and a control apparatus which controls the core node, controls each of the core nodes existing in an aggregated network into which one or more the core nodes are aggregated, and converts an aggregated flow specified for an aggregated network and received from the control apparatus to a real flow specified for each of the core nodes in the aggregated network based on connection relationships between the core nodes in the aggregated network, information specifying a real port which is a port through which the core node in the aggregated network is connected to a device outside the aggregated network and a real node which is the core node having the real port for each the aggregated networks.