1. A method for processing databases in a system which includes a plurality of storage areas each storing a database and a plurality of computers each having a database management program running thereon which manages one of said plurality of storage areas, each said storage area being associated with only said computer managing said storage area, said method comprising: when a failure has occurred in one of said plurality of computers as a failed computer, obtaining preset substitution information indicating that the storage area managed by the database management program running on said failed computer is to be managed by the database management program running on another one of said plurality of computers as a substitute computer; and based on said substitution information, changing association of said storage area with said failed computer to said substitute computer, said storage area to be managed by said database management program running on said substitute computer.