Access right managing method for accessing multiple programs

A computer system comprising:

• at least one storage system, which includes hard disk drives configuring a plurality of logical units, and which are managed by at least one management computer as storage resources,
• wherein the at least one management computer includes a first storage management program, a second storage management program, a system management program, first management authority information, second management authority information, and resource correspondence information,
• wherein the first storage management program makes the at least one management computer manage a first management resource, which is a part of the storage resources, based on the first management authority information indicating management authorities of a plurality of administrators to the first management resource,
• wherein the second storage management program makes the at least one management computer manage a second management resource, which is another part of the storage resources, based on the second management authority information indicating management authorities of the plurality of administrators to the second management resource,
• wherein the system management program makes the at least one management computer manage the storage resource based on the resource correspondence information, which indicates correspondences between the storage resources including the plurality of logical units and management programs which include the first storage management program and the second storage management program,
• wherein, by the system management program, the at least one management computer receives a management authority update request identifying at least one certain storage resource which is one or more of the storage resources and a certain administrator which is one or more of the plurality of administrators,
• wherein, by the system management program, the at least one management computer selects one of the first storage management program and the second storage management program, which makes the at least one management computer manage at least one certain logical unit associated with the at least one certain storage resource, and requests update of a management authority of the certain administrator about the at least one certain logical unit to the one of the first storage management program and the second storage management program, based on the resource correspondence information, and
• wherein, by the one of the first storage management program and the second storage management program, the at least one management computer updates the one of the first management authority information and the second management authority information about the at least one certain logical unit.