A communication control device that is included in a mobility network system including one or more electronic control units and a network bus, the communication control device connecting an electronic control unit of the one or more electronic control units to the network bus, the communication control device being disposed between the electronic control unit of the one or more electronic control units and the network bus, the electronic control unit transmitting a message and receiving a message via the communication control device, the communication control device, comprising: a communicator configured to receive a message from the electronic control unit and to transmit the message to the network bus, and to receive a message from the network bus and to transmit the message to the electronic control unit; a transmission identification, ID, list holder configured to hold a transmission ID list; and a controller configured to control the communicator and the transmission ID list holder, characterized in that when the transmission ID included in the message transmitted from the electronic control unit is not in the transmission ID list, the controller is configured to add the transmission ID to the transmission ID list and to transmit an ID information item related to the transmission ID list to the network bus, the communicator is configured to receive an anomaly notification message indicating information related to an anomalous transmission ID list, and the controller is configured to determine an anomalous transmission ID by using the information related to the transmission ID list included in the anomaly notification message to match the information related to the transmission ID list stored in transmission ID list holder. the communication control device connecting an electronic control unit of the one or more electronic control units to the network bus, the communication control device being disposed between the electronic control unit of the one or more electronic control units and the network bus, the electronic control unit transmitting a message and receiving a message via the communication control device, the communication control device, comprising: a communicator configured to receive a message from the electronic control unit and to transmit the message to the network bus, and to receive a message from the network bus and to transmit the message to the electronic control unit; a transmission identification, ID, list holder configured to hold a transmission ID list; and a controller configured to control the communicator and the transmission ID list holder, characterized in that when the transmission ID included in the message transmitted from the electronic control unit is not in the transmission ID list, the controller is configured to add the transmission ID to the transmission ID list and to transmit an ID information item related to the transmission ID list to the network bus, the communicator is configured to receive an anomaly notification message indicating information related to an anomalous transmission ID list, and the controller is configured to determine an anomalous transmission ID by using the information related to the transmission ID list included in the anomaly notification message to match the information related to the transmission ID list stored in transmission ID list holder. a communicator configured to receive a message from the electronic control unit and to transmit the message to the network bus, and to receive a message from the network bus and to transmit the message to the electronic control unit; a transmission identification, ID, list holder configured to hold a transmission ID list; and a controller configured to control the communicator and the transmission ID list holder, characterized in that when the transmission ID included in the message transmitted from the electronic control unit is not in the transmission ID list, the controller is configured to add the transmission ID to the transmission ID list and to transmit an ID information item related to the transmission ID list to the network bus, the communicator is configured to receive an anomaly notification message indicating information related to an anomalous transmission ID list, and the controller is configured to determine an anomalous transmission ID by using the information related to the transmission ID list included in the anomaly notification message to match the information related to the transmission ID list stored in transmission ID list holder.