A computer system in which one or more host computers 30 having a FC (Fibre Channel) node port and one or more storage apparatuses 40 having a FC node port are coupled via a FC fabric. The storage apparatus acquires first information related to access control for controlling access to a relevant storage apparatus by the host computer. The storage apparatus, based on the first information, creates second information for defining the host computer that is able to access the relevant storage apparatus, and registers this second information in the fabric.