Abstract: The control unit includes a retrieval target article identification unit configured to identify a retrieval target article from among the articles stored in the storage unit on the basis of retrieval information indicating a retrieval completion state, a reverse sequential operation calculation unit configured to calculate a reverse sequential operation when it is assumed that the retrieval target article is moved to the storage position in the storage unit in a reverse sequence from the retrieval completion state, and a retrieval operation calculation unit configured to calculate a retrieval operation in which the retrieval target article is moved from the storage position in the storage unit and is in the retrieval completion state by reproducing the reverse sequential operation in reverse.

Abstract: A communication system includes a power-sourceless terminal (10) and a transmitting station (20). The power-sourceless terminal includes a photoelectric conversion section for receiving an intensity modulated optical signal and converting it to an electric signal, and a voice output section for outputting the electric signal passing through the conversion by the photoelectric conversion section in the form of voice. The transmitting station includes a transmission section for transmitting the optical signal having its intensity modulated depending on an electric signal of the information to be transmitted.