To provide a network apparatus the load of which by a management apparatus side for initial setting for connection to a communication network is reduced, and to provide a management apparatus thereof, a network connection method, and a network connection management method thereof.

When the network apparatus such as an ADSL MODEM connected to a communication network via an ADSL line facility is physically connected to a port of the ADSL line facility (step S301), whether or not the connection is a first connection (or access) is checked (step S302), when the connection is the first connection, the network apparatus receives provision of a first time flag (step S303), and informs the ADSL line facility to request the management side for the initial setting.