Abstract: A data management system includes an operating-mode node, and a standby-mode node, wherein the operating-mode node includes a first memory that includes a temporary storage space, and a first processor coupled to the first memory and the first processor configured to process a received process request, in a case where the received process request is a batch process request which includes a plurality of process commands, sequentially execute the process commands, store process-completion data corresponding to each of the process commands in the temporary storage space every time the execution of each of the process commands is completed, in a case where the process-completion data stored in the temporary storage space is referred to in processing for another process request, transmit predetermined process-completion data to the standby-mode node, and when execution of all the process commands is completed, transmit un-transmitted process-completion data to the standby-mode node to perform data synchronization.