Abstract: A service system stores membership qualification conditions of a plurality of services. The service system selects a service that a user can use from those and displays the selected service. The service system references information of another service of which a user has already become a member and performs a membership qualification of the user on behalf of a server of each service.

Abstract: When a user does shopping on a commodity purchase screen provided by a shop via the Internet, the user uses a payment reservation service provided by a claim management server. Then, the claim management server stores the shopping content of the user as a database and simultaneously stores both a payment amount and a settled/unsettled payment status in the shopping contents. The user views the list of unsettled payment of the shopping content provided by the claim management server, selects a shopping item, the price payment of which the user is going to settle, designates an account handling institute to use and settles payment online. The claim management server automatically does the check work of the shopping content, the price payment of which is settled.

Abstract: When a user presents a common certificate in common with a plurality of services and accesses to one of those services, the system determines whether or not the certificate corresponds to a pre-registered certificate. When the user's certificate corresponds to the pre-registered certificate, the system permits the use to use the accessed service.

Abstract: A service system stores membership qualification conditions of a plurality of services. The service system selects a service that a user can use from those and displays the selected service. The service system references information of another service of which a user has already become a member and performs a membership qualification of the user on behalf of a server of each service.

Abstract: A mall server with a product search function, in which each product category has a particular effective period during which it is presented to customers as a selectable search key. In a virtual shopping mall system, customers can conduct a search for a set of products by designating a particular product category as a search key. As part of a mall server, a category master table stores a plurality of product categories accompanied by information on their respective effective periods, and a product master table stores information on various online products along with their respective category definitions. Based on the category master table, a product search screen generation unit produces product search screen data containing a set of categories whose effective periods include the present date. Receiving the product search screen data from the mall server, the customer terminal displays a product search screen including a category selection menu to provide the customer with a list of selectable categories.