COMMUNICATION CONTROL DEVICE, COMMUNICATION CONTROL METHOD, NETWORK SWITCH, ROUTE CONTROL METHOD, AND COMMUNICATION SYSTEM

[Solution] The communication control device includes: a synchronization detection unit configured to detect a synchronization timing from a synchronization signal; and a transmission control unit configured to cause a communication unit to transmit a control signal for changing a communication route of data to which a flag specified on the basis of the synchronization signal is added, to a network switch performing relay between a reception device and a plurality of transmission devices transmitting the data to which the flag is added while changing the flag at the synchronization timing, at a timing corresponding to the synchronization timing.