A service providing system, including a service using device; a service providing device for providing a service to the service using device, the service providing device being communicably connected to the service using device; and a template transmitting device for transmitting a template to the service using device, the template containing: transmission destination information indicating a transmission destination to which the service using device transmits data for use in authentication; and user input assisting information based on which display device either provided in the service using device or communicably connected to the service using device displays an interface for use by a service user entering data to the service using device.