A transmission comprises a casing, an output element, a hydrostatic stepless transmission unit and a forwardbackward traveling direction selecting unit. Accordingly, selection-candidate update processing to find a new device and processing for displaying candidates meeting set conditions to display candidates which meet set conditions are provided, so as to display a device list window displaying selection candidates in a case where a set condition is, e. A user’s information may be automatically transmitted during checkout so that the user is not required to provide user name, password, billing information, or shipping address information. The auxiliary display screen is an e-paper type and is for delivering e-books.