The access network manager terminal 5 makes a communication quality agreement with the core network manager terminal 3, the core network manager terminal 3 conducts resource assignment of the core network 100 based on the communication agreement, notifies the access network manager terminal 5 of password information of the assigned resource and notifies the edge router 1a of password authentication information. The user terminal 4a communicates a password sent from the access network manager terminal 5 in response to a resource use permission request as being contained in a header of a packet and the edge router 1a authenticates the password of the packet based on the password authentication information.