A disclosed function expansion apparatus for expanding a function of an information processing apparatus by connecting the information processing apparatus to an external storage apparatus via a first interface includes a first storage unit that stores first setup information used for connecting the information processing apparatus to the external storage apparatus, a connection module unit that is operated based on the first setup information and connects the information processing apparatus to the external storage apparatus via the first interface, a control unit that is connected to the first storage unit, and the connection module unit or a second storage unit, and stores second setup information stored in the second storage unit into the first storage unit, wherein the second storage unit is exchangeable with the connection module unit and stores the second setup information in connecting to the connection module unit.