providing a remote copy system for performing remote copy between a plurality of sites each constituted by a plurality of storage subsystems , wherein even if sub - data volumes at the remote site belong to the different storage subsystems , the update order of data copied from the main site to these sub - data volumes can be maintained in these sub - data volumes . pieces of update data for a plurality of primary data volumes at the main site are sequenced and collectively stored in a common primary journal volume , the pieces of update data in the primary journal volume are remote - copied to a sub - journal volume shared by a plurality of storage subsystems at the remote site , the pieces of update data in the sub - journal volume are sorted in a time order and allocated to a plurality of sub - data volumes belonging to different storage subsystems to be written therein .