A communication device includes a communicator that performs communication via a network, IO ports that connect with a manufacturing apparatus, a packet monitor that monitors, via the communicator, packet data communicated to and from the manufacturing apparatus via the network, an IO monitor that monitors states of the IO ports, and a controller configured or programmed to transmit monitoring information to a transportation apparatus via the communicator, the transportation apparatus transporting a processing target, and the monitoring information being obtained through the monitoring performed by the packet monitor and the IO monitor.