A data processing apparatus includes a storage device having a replication generation function for replicating a data base to create a replication data base, and stores data and a plurality of log information in transaction processing that uses the data in the storage device, selects a transaction that is performing a data operation without meeting a predetermined condition after synchronization between the data base and the replication data base is released, and performs the data operation cancellation processing to the replication data base by the selected transaction. It also selects a transaction, which meets the predetermined condition and is not performing a data operation to the replication data base, to perform a data operation to the replication data base with the selected transaction. It then becomes possible to reduce the burden for the data processing apparatus during using the replication data base.