1. A storage system comprising: one or more storage devices corresponding to at least one first logical volume and at least one second logical volume; a storage controller being adapted to be coupled to a plurality of computers and to store first security information indicating a relationship between at least one computer group including one or more of the plurality of computers and the at least one first logical volume accessible for the one or more of the plurality of computers included in at least one computer group and to store second security information indicating a relationship between at least one of the plurality of computers and the at least one second logical volume accessible for the at least one of the plurality of computers; and a display device being adapted to be coupled to the storage controller and to display both the first security information and the second security information.