Abstract: Card information is managed in a data center interposed between a plurality of financial institutions which issue cards and users which use the issued cards. The data center registers card information including card numbers and card status information into a database correspondingly to user IDs established in advance. The data center checks a user ID transmitted from a terminal operated by corresponding one of the users with each of user IDs registered in the database. As a result of the checking, if there is a registered user ID coinciding with the transmitted user ID, the data center invalidates card status information corresponding to at least one card selected by the user out of card information of the user. Then, the data center transmits a request to invalidate the selected card to a corresponding financial institution which has issued the selected card while designating card number of the card.

Abstract: A system for enabling a system down due to a lack of ability to be avoided and enabling a dynamic backup to be performed by properly allocating resources to a processing ability is provided. Each of a plurality of host systems connected through an information network is provided with a system status monitering and change instructing mechanism which is physically independent of other component elements of the relevant host system, has a status management table of resources such as IPs, memory segments, and the like, and can enhance and reduce an ability of the host.