Patent 7302688 was granted and assigned to NEC Corporation on November, 2007 by the United States Patent and Trademark Office.
A cellular phone has a competition manager for controlling a competition between an inquiry task which inquires whether or not the inquiry task is allowed to start and a competing task having a competition with the inquiry task because these two of the tasks use a common lower-level functional unit. The competition manager is implemented by a competition management program which is independent from other application programs.