To exchange maintenance information between policy servers without providing the function of any special protocol other than a standard protocol such as a COPS at the policy server.

At the time of receiving a COPS message transmitted from a policy server 3 of its own domain A, a network equipment 1 transmits an RSVP message including a COPS message to the adjacent network equipment of the other domain B. At the time of receiving the RSVP message, the network equipment of the domain B analyzes the contents of the message, and acquires the COPS message from the RSVP message, and transmits it as the COPS message to the policy server of the domain B.