Points accumulated through a customer's purchase from a point service provider are kept track of by customer information databases in corresponding point service provider servers. A user uses user terminals to access a trade service provider, and receives various services, for example, point trading and point cash, offered by the trade service provider. The trade service provider accesses, as appropriate, the point service provider servers, so that the user's accumulated points are checked or updated. In this manner, the user can effectively use his/her points with no waste, and accordingly the point service system can be improved in its effective use.