| 摘要 |
PROBLEM TO BE SOLVED: To provide a mobile communication terminal device which is available for a user at an optimal visual field angle corresponding to the situation surrounding the user by providing functions for automatically switching a visual field angle or notifying the user of whether switching of a visual field angle is required, in cooperation with a mode selected by a volume switching means. SOLUTION: When a silent mode button 202 is operated, regarding the volume of a ring back tone of a speaker 205, an ordinary mode and a silent mode are switched, regarding a visual field angle of a main display device 101, a wide visual field mode and a narrow visual field mode are switched, and the narrow visual field mode and the silent mode are cooperated. Furthermore, if a private mode button 203 is operated, the wide visual field mode and the narrow visual field mode are switched, but such operation of the private mode button 203 is canceled by subsequently turning off and turning on again a main power source. COPYRIGHT: (C)2007,JPO&INPIT
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