In a data library apparatus for managing plural pieces of record media, and performing record/reproduction of data into/from the record media, there are provided an information-memorizing memory unit and a device-controlling control unit. Having received a data record/reproduction processing request from a server, the control unit collects load information imposed on data record/reproduction devices, load information imposed on a record-media transportation device, and load information imposed on the record media. Moreover, the control unit memorizes the collected load information into the memory unit.