According to one aspect of the invention, when an algorithm bay is connected to a signal processing apparatus according to a first connection mode, a selector of the algorithm bay selects and sets a first function provided by a first function provider as the signal processing function of the signal processing apparatus. When the algorithm bay is connected to the signal processing apparatus according to a second connection mode, the selector of the algorithm bay selects and sets a second function provided by a second function provider as the signal processing function of the signal processing apparatus. According to another aspect of the invention, a first information provider of an algorithm bay supplies a signal indicating first information to be used in the signal processing of a signal processor of a signal processing apparatus to the signal processor via a wired interface of the algorithm bay, wired connection, and a wired interface of the signal processing apparatus. A second information provider of the algorithm bay supplies a signal indicating second information of changing the signal processing function of the signal processor to the signal processor via a wireless interface of the algorithm bay, wireless connection, and a wireless interface of the signal processing apparatus.