Provided is a storage system in which a plurality of virtual volumes obtained by replicating a master virtual volume are provided to each of a plurality of virtual machines of a physical server, respectively, the storage system including: a snapshot management unit that configures a continuous scan generation from the plurality of virtual volumes; a selection processing unit that groups into at least one scan group on the basis of a duplication rate of the plurality of virtual volumes included in the continuous scan generation; and a path setting unit that collectively unmounts the plurality of virtual volumes belonging to the scan group from the physical server in a case where a replica of the virtual volume selected by the selection processing unit is attached to a virus scanning server and one of the plurality of virtual volumes belonging to the scan group is infected with virus.