For reporting an emergency at a minimal level if a user enters the emergency and requires a help of a third party, a portable telephone terminal device receives reported information S1 constantly transmitted from a radio base station in a country and a district in which the user is roaming, and obtains basic information for use in the communications with the radio base station. The technique includes transferring information from an application server to a gateway that processes the information, transferring the gateway processed information from the gateway to a plurality of adapters associated with the gateway that process the gateway processed information, and transferring the adapter processed information from one of the adapters to a client. When the undoped AlGaN layer is formed, droplets of Ga or Al are formed on the n type AlGaN layer. This conversion step is includes exposing the metal layer to an inert heat transferring gas in a convection or conduction apparatus. This renders possible a rapid and stepless variation of the pressure state in the branch flow duct.