DATA RETRIEVAL SYSTEM AND DATA RETRIEVAL METHOD

A data retrieval system includes a first apparatus and a second apparatus. The first apparatus includes a distributor, a processing state receptor, and a completion determiner. The distributor distributes a query to one or more devices which can retain data. The processing state receptor receives, from the second apparatus, information indicating processing states of the devices for the query. The completion determiner determines whether the query is complete from the received processing state. The second apparatus includes a transceiver, a process manager, and a processing state transmission controller. The transceiver receives a query distributed by the first apparatus and transmits the query to the devices. The process manager manages a processing state indicating whether each device completes the query on the basis of a received processing result of the query of each device. The processing state transmission controller transmits managed processing states of the query to the first apparatus.