A datacenter, a communication apparatus, a communication method, and a communication control method in a communication system are provided that can enhance the versatility of a datacenter and a virtual network constructed therein. A communication system includes: a communication facility owned by at least one network operator; and a datacenter connected to the communication facility over a network, wherein the datacenter includes: a first virtual network that implements mobile communication functions by using the communication facility; a second virtual network that provides a cloud service; and a communication means, wherein the communication means includes: a reception means for receiving traffic from the communication facility; and a distributing means for distributing the received traffic to either the first virtual network or the second virtual network.