Charging system and charging method

A system for providing a service to a user, comprising:

• means for receiving a service request requesting desired service for the user from a service provider and a digital signature generated based on said service request from a user terminal;
• means for providing the service to the user terminal according to said service request;
• means for requesting a charge collection from an accounting terminal based on said service request;
• and
• means for providing said service request and said digital signature to said accounting terminal when a disclosure request of service requests and digital signatures is received.

A system for providing a service to a user, comprising:

• a service provider for receiving from a user terminal a service request requesting desired service for the user and a digital signature generated based on said service request, wherein the service provider
• provides the service to the user terminal according to said service request,
• requests a charge collection from an accounting terminal based on said service request, and
• provides said service request and said digital signature to said accounting terminal when a disclosure request of service requests and digital signatures is received.