A first medical device stores first additional information that is to be added to first information related to a subject. A second medical device stores second additional information that is to be added to second information related to the subject. A first communicator communicates the second information and part or all of the second additional information stored in the second medical device, between the first medical device and the second medical device via a network defined by a prescribed protocol different from the DICOM protocol. A DICOM information generator generates DICOM-format data for the second information on the basis of at least information received via the first communicator. A second communicator communicates DICOM-format data with the DICOM server via a network defined by the DICOM protocol, the DICOM-format data being for the second information and being generated by the DICOM information generator.
