Communication control system and communication control method

A communication control system comprising:

• a control device;
• one or more control target devices;
• and
• a network configured to connect the control device to the one or more control target devices, wherein:
• at least one of the one or more control target devices includes a sub-master and a sub-slave to be synchronously controlled with each other;
• and
• the control device includes circuitry configured to:
• store pieces of information on a synchronization period that is a period for synchronizing with then at least one of the one or more control target devices, communication periods that are a plurality of periods provided during one period of a corresponding synchronization period, and mutual communication control information for enabling the sub-master and the sub-slave to mutually communicate in a mutual communication period shorter than the synchronization period;
• calculate a control command, for each control target device, for commanding an operation of each control target device in synchronization with the at least one of the one or more control target devices;
• and
• transmit the control command including mutual communication control information to the sub-master and the sub-slave of the at least one of the one or more control target devices.