An apparatus for updating software or changing configuration of software installed in a plurality of terminals, including: a recognition unit for recognizing that the software installed in a first terminal has been successfully updated or the configuration of the software installed in the first terminal has been successfully changed; a selection unit for selecting, in response to the recognition that the software installed in the first terminal has been successfully updated or the configuration of the software installed in the first terminal has been successfully changed, a second terminal in a case where a degree of similarity between a configuration of the first terminal and a configuration of the second terminal is equal to or higher than a predetermined reference value; and an instruction unit for giving an instruction to update the software or to change the configuration of the software installed in the second terminal.