1. A computer system comprising: at least one host computer having a FC (Fibre Channel) node port; and a plurality of storage apparatuses, each of the storage apparatuses having a FC node port, the at least one host computer and the storage apparatuses coupled via a FC fabric, wherein the plurality of storage apparatuses comprise a migration-source storage apparatus which constitutes a migration source of a migration-target resource, and a migration-destination storage apparatus which constitutes a migration destination of the migration-target resource, wherein, prior to migrating the migration-target resource, the migration-destination storage apparatus is configured to: acquire, directly or indirectly from the migration-source storage apparatus, first information related to access control for controlling access to the migration-source storage apparatus by the at least one host computer, wherein the first information is created, in the migration-source storage apparatus, as host group information which denotes a relationship between a port name identifier of the at least one host computer and a logic unit inside the migration-source storage apparatus and which defines a logical unit identifier of the logic unit accessible to the port name identifier of the at least one host computer; create, based on the first information, second information for defining one of the at least one host computer that is able to access the migration-destination storage apparatus by migrating the host group information, which denotes the relationship between the port name identifier of the at least one host computer and the logic unit inside the migration-source storage apparatus, from the migration-source storage apparatus to the migration-destination storage apparatus, and updating information associated with a migration-destination storage port of the migration-destination storage apparatus to allow access by the one of the at least one host computer to the migration-destination storage port of the migration-destination storage apparatus; register the created second information in the FC fabric.