Communication terminal, method of communication and communication system

A communication system comprising:

• a forwarding apparatus that forwards a packet;
• a control apparatus that informs the forwarding apparatus of a processing rule prescribing a packet processing method;
• and
• a communication terminal, wherein the communication terminal comprises:
• a router that communicates with a network system including the forwarding apparatus and the control apparatus;
• and
• at least one controller that determines a processing operation to be executed by the network system instead of the communication terminal from among packet processing operations, wherein the packet processing operations were originally to be executed by the communication terminal which takes the place of the control apparatus to
• inform the forwarding apparatus of a processing rule corresponding to the determined packet processing operation.