A virtualization switch includes first communication line connection terminals which can be connected to a host computer, a physical storage apparatus or a plurality of physical storage apparatuses, and another virtualization switch, a second communication line connection terminal which can be connected to a single line concentrator or a plurality of line concentrators connected to a manager computer by a second communication line a storage virtualization unit, a first communication unit which can communicate with an other virtualization switch through a first communication line, second communication unit which can communicate with the other virtualization switch through an second communication line, second communication line monitor unit which test communication between the virtualization switch, and abnormal state coping unit which executes a closing process and causes the first communication unit to output a failover designation instruction.