According to one aspect of the invention, a storage system comprises: a plurality of storage devices; and a controller operable to manage a secondary volume, of a remote copy pair with a primary volume of another storage system, and corresponding to a portion of the plurality of storage devices. The secondary volume has a function for storing data included in journal data sent from said another storage system according to a remote copy procedure. The controller is operable to handle the journal data to be stored temporarily in a third volume corresponding to another portion of the plurality of storage devices before storing the data of the journal data to the secondary volume, if a relationship between the journal data and another journal data, which has smaller sequence number than sequence number of the journal data and is sent from said another storage system to the storage system, has a condition.