NETWORK SYSTEM AND METHOD FOR PROVIDING ADDED HIGH FUNCTION SERVICE

PROBLEM TO BE SOLVED: To provide other high function service not served by an intelligent network by using the intelligent network. SOLUTION: Upon a request of a high function service from a user node (d), a transfer layer node (b) delivers the request to a high function layer node (a), an when the requested high function service is a service provided by a communication provider node (c), the high function layer node (a) delivers the service to the communication provider node (c) decides a utility form of a transmission service served by the transfer layer node (b) through negotiation with the high function layer node (a), utilizes the transfer service served by the transfer layer node (b) according to the decided utility form and serves the requested high function service to the user node (d).