Network communication apparatus

Provided is a network communication apparatus that is capable of, even when each node to be connected is undefined, managing a connection state of the node with ease. The network communication apparatus includes at least one node connected to a network and a management node that manages each of the at least one node. Each of the at least one node includes a data transmission and reception unit for transmitting and receiving data containing an ID field giving contents of the data and a data field giving an entity of the data, and an analyzing unit for analyzing meanings of the ID field and a data field of received data. The management node collects attribute information from each of the at least one node, and assigns and gives a node ID number to each of the at least one node based on the collected attribute information.