COMMUNICATION SYSTEM, COMMUNICATION PROCESS DEVICE, AND DEVICE ADDITION METHOD

A communication system includes: a first node; and a second node that is located at a lower level of the first node and connected to the first node. The second node includes a transmitter that transmits, when the second node is connected to the first node, function identification information for identifying functions installed in the second node, and the first node includes a receiver that receives the function identification information transmitted from the second node, and a processor that is connected to the receiver. The processor executes a process including deciding, based on the function identification information, a function to be enabled or disabled out of the functions installed in the second node, and selecting at least a test item used for verifying the function that is decided to be enabled.