Pairs are formed from a plurality of dispersed volumes and copying between the volumes is conducted by a series of remote operations from a management server. A management server 10 instructs the generation of configuration setting files 23, 30 to host computers 20, 30 selected so as to form copy pairs. If the configuration setting files are generated by host agents 21, 31, the management server 10 instructs copy start to a host computer 20 having a primary volume. The host agent 21 generates a prescribed command via a copy pair control module 22 and causes a storage subsystem 40 to execute copying between the volumes. When copying is completed, the management server 10 acquires the newest storage configuration information from the storage subsystem 40 and updates configuration information DB12.