A service providing server machine and a service utilizing client machine which constitute a system for providing and utilizing two-stage services consisting of a tentative service (e.g., non-chargeable experience service) and a regular service (e.g., chargeable full-support service) over a communication line such as the internet so that a service system integrating the system may increase the users.Displaying the point value changing corresponding to the available time on the regular service when the tentative service is utilized on the client machine.