Communication control device, communication system, and communication control method

A communication system including a communication control device for a vehicle including a plurality of host vehicle communication devices each including a different communication object, the communication control device comprising:

• an unauthorized state detector to detect an unauthorized state occurring from communication using an unauthorized host vehicle communication device out of the plurality of host vehicle communication devices;
• and
• a communication controller to execute control for transmitting host vehicle unauthorized state information related to the unauthorized state by using at least one normal host vehicle communication device out of the plurality of host vehicle communication devices excluding the unauthorized host vehicle communication device when the unauthorized state is detected.

A communication control method for a vehicle including a plurality of host vehicle communication devices each including a different communication object, the method comprising:

• detecting an unauthorized state occurring from communication using an unauthorized host vehicle communication device out of the plurality of host vehicle communication devices;
• and
• executing control for transmitting host vehicle unauthorized state information related to the unauthorized state by using at least one normal host vehicle communication device out of the plurality of host vehicle communication devices excluding the unauthorized host vehicle communication device when the unauthorized state is detected.