To inhibit the occurrence of communication failures in the system in which a secondary storage control apparatus acquires journal data from a primary storage control apparatus and writes the data to a secondary volume. The primary storage control apparatus comprises a command processing unit, a journal data creation unit, a journal data transfer unit which reads journal data to the secondary storage control apparatus, and a transfer control unit. In specified occasions, the transfer control unit controls at least either one of the journal data transfer amount by the journal data transfer unit and the width of the communication band utilized for journal data transfer.