The plurality of components included in the image processing apparatus 10 may be distributed in a plurality of housings. For example, at least one of the fluctuation generating portion 31, the connection identifying portion 32, the device identifying portion 33, the determination portion 34, and the output portion 35 need not to be configured as one function of the main body control portion 16, and may be provided separately from the main body control portion 16 or may be provided in the expansion device 2 or the like other than the main body 1.
In addition, a configuration of the fluctuation generating portion 31 is not limited to a configuration in which the operation (switching operation) of the main body power supply portion 18 is controlled by the remote signal, and may be a configuration in which the output power of the main body power supply portion 18 is fluctuated. For example, the fluctuation generating portion 31 fluctuates the output power of the main body power supply portion 18 by opening and closing a relay provided between the output of the main body power supply portion 18 and the power output terminal 41 of the main body 1.