To perform data transfer among systems, without having to stop the systems.

A processing request means 1b transmits a processing request A to a transfer destination data processing system 2. When data that is a processing object is absent in the transfer destination data processing system 2, a data request means 1c requests a transfer source data processing system 3 to provide the data. When the data is present in the transfer source data processing system 3, the data request means 1c acquires and outputs the data to a registration request means 1d. When the data is absent, a reprocessing request means 1e transmits the processing request A to the transfer destination data processing system 2. The registration request means 1d, when it acquires the data from the data request means 1c, requests the transfer destination data processing system 2 to register the data. When the data is already registered in the transfer destination data processing system 2, the reprocessing request means 1e transmits the processing request A to the transfer destination data processing system 2.

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