An operation terminal for causing a plurality of audio devices to process a multi-channel digital audio signal through cooperation among the plurality of audio devices , comprising: performance information acquisition means configured to acquire, from each one of the plurality of audio devices , performance information including an adaptable channel count and a signal processing time of the one of the plurality of audio devices ; channel distribution means configured to distribute an audio channel to be processed to each of the plurality of audio devices , based on the adaptable channel count included in the performance information acquired by the performance information acquisition means from each of the plurality of audio devices ; output delay time determination means configured to determine, for each of the plurality of audio devices , an output delay time so that timing of outputting an analog audio signal matches in the plurality of audio devices , based on the signal processing time included in the performance information acquired by the performance information acquisition means from each of the plurality of audio devices ; and settings information notification means configured to notify, to each one of the plurality of audio devices , settings information including the audio channel to be processed that is distributed to the one of the plurality of audio devices by the channel distribution means and the output delay time determined for the one of the plurality of audio devices by the output delay time determination means , wherein the channel distribution means is configured to distribute the audio channels to be processed to the plurality of audio devices by prioritising the plurality of audio devices in descending order of the respective adaptable channel counts of the plurality of audio devices . performance information acquisition means configured to acquire, from each one of the plurality of audio devices , performance information including an adaptable channel count and a signal processing time of the one of the plurality of audio devices ; channel distribution means configured to distribute an audio channel to be processed to each of the plurality of audio devices , based on the adaptable channel count included in the performance information acquired by the performance information acquisition means from each of the plurality of audio devices ; output delay time determination means configured to determine, for each of the plurality of audio devices , an output delay time so that timing of outputting an analog audio signal matches in the plurality of audio devices , based on the signal processing time included in the performance information acquired by the performance information acquisition means from each of the plurality of audio devices ; and settings information notification means configured to notify, to each one of the plurality of audio devices , settings information including the audio channel to be processed that is distributed to the one of the plurality of audio devices by the channel distribution means and the output delay time determined for the one of the plurality of audio devices by the output delay time determination means , wherein the channel distribution means is configured to distribute the audio channels to be processed to the plurality of audio devices by prioritising the plurality of audio devices in descending order of the respective adaptable channel counts of the plurality of audio devices . <EOS>