A storage system configured to perform asynchronous remote copy, the storage system comprising: a first storage apparatus having a first data volume for storing write data sent from a first host computer and a first journal volume for storing journals, wherein the first storage apparatus is configured to write the write data received from the first host computer to the first data volume and wherein each journal comprises write data written to the first data volume and a corresponding sequential number (SEQ#); a second storage apparatus having a second journal volume for storing journals sent from the first storage apparatus and a second data volume to which the journals stored in the second journal volume are reflected in order of sequential numbers comprised in the respective journals; and a third storage apparatus having a third journal volume for storing journals sent from the first storage apparatus and a third data volume to which the journals stored in the third journal volume are reflected in order of sequential numbers comprised in the respective journals; characterized in that the second storage apparatus is configured to determine, when a failure occurs in the first storage apparatus, which of a second sequential number (SEQ#) being comprised in a journal, which was latest reflected to the second data volume of the second storage apparatus, and a third sequential number (SEQ#) comprised in a journal, which was latest reflected to the third data volume of the third storage apparatus, represents the newer sequential number, and the second storage apparatus is further configured to receive, if the third sequential number (SEQ#) is newer than the second sequential number (SEQ#), one or more differential journals from the third storage system, and to write the received differential journals to the second journal volume, and the second storage apparatus is further configured to send, if the second sequential number (SEQ#) is newer than the third sequential number (SEQ#), one or more differential journals to the third storage system, wherein the third storage apparatus is then configured to receive the one or more differential journals from the second storage apparatus and to write the received differential journals to the third journal volume. a first storage apparatus having a first data volume for storing write data sent from a first host computer and a first journal volume for storing journals, wherein the first storage apparatus is configured to write the write data received from the first host computer to the first data volume and wherein each journal comprises write data written to the first data volume and a corresponding sequential number (SEQ#); a second storage apparatus having a second journal volume for storing journals sent from the first storage apparatus and a second data volume to which the journals stored in the second journal volume are reflected in order of sequential numbers comprised in the respective journals; and a third storage apparatus having a third journal volume for storing journals sent from the first storage apparatus and a third data volume to which the journals stored in the third journal volume are reflected in order of sequential numbers comprised in the respective journals; characterized in that the second storage apparatus is configured to determine, when a failure occurs in the first storage apparatus, which of a second sequential number (SEQ#) being comprised in a journal, which was latest reflected to the second data volume of the second storage apparatus, and a third sequential number (SEQ#) comprised in a journal, which was latest reflected to the third data volume of the third storage apparatus, represents the newer sequential number, and the second storage apparatus is further configured to receive, if the third sequential number (SEQ#) is newer than the second sequential number (SEQ#), one or more differential journals from the third storage system, and to write the received differential journals to the second journal volume, and the second storage apparatus is further configured to send, if the second sequential number (SEQ#) is newer than the third sequential number (SEQ#), one or more differential journals to the third storage system, wherein the third storage apparatus is then configured to receive the one or more differential journals from the second storage apparatus and to write the received differential journals to the third journal volume.