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