An image acquisition system includes an image acquisition device and a commanding device configured as a member separate from the image acquisition device to transmit a command to the image acquisition device for controlling the image acquisition device in such a manner as to permit the image acquisition device to operate in response to the command. The image acquisition device transmits to the commanding device identification information permitting the image acquisition device to identify the commanding device. The commanding device receives the transmitted identification information and transmits a command with authentication information contains authentication information permitting the image acquisition device to authenticate the commanding device, the authentication information containing one of the received identification information and information derived from the identification information.