1. An access right managing method, which is used in a computer system comprising a storage system and a management computer for managing the storage system, for managing an access right of a resource of the storage system, the management computer comprising an interface connected to the storage system, a processor connected to the interface, and a memory connected to the processor, the access right managing method comprising: storing, in the memory, a management program for managing the resource of the storage system, access right definition information for defining the access right of the resource managed by the management program, and resource correspondence information which includes information on a management program for managing another resource related to the resource managed by the management program; updating, by the processor, in case of which the processor receives an updating request for the access right of the resource managed by the management program, the access right of the resource which is required to be updated based on the received updating request for the access right of the resource; selecting, by the processor, a management program corresponding to the resource whose access right is required to be updated based on the resource correspondence information; specifying, by the processor, based on the resource correspondence information, a resource which is managed by the selected management program and is related to the resource whose access right is required to be updated; transmitting, by the processor, an access right updating request for the specified relative resource to the management computer for executing the selected management program; and updating, by the processor, in case of which the processor of the management computer for executing the selected management program receives the access right updating request for the specified relative resource, the access right of the specified relative resource based on the received updating request.