In order to improve the reception capability of a portable terminal device while waiting for calls from a satellite, a small reflecting plate in the form of a saucer is disposed below a rod-shaped satellite communication antenna which is folded to hold downwardly when the portable terminal device is in the state of on-hook, waiting for calls. The metal conductor has a first slit located corresponding to a middle side of the three sides and a second slit located extending downward from one of the two corners, the second slit being communicated with the first slit and having an opened end. The spin daemon, after receiving a flag monitor request, monitors the flag and, after the flag changes condition, enables the process to be re-scheduled for execution by the computer.