| 摘要 |
PROBLEM TO BE SOLVED: To easily provide an inexpensive security system by using a portable terminal. SOLUTION: This system comprises an approach detection part 20 determining an approaching person by detection of a sudden change of light by an optical sensor of the portable terminal 80 or the like; and a trespass determination part 40 determining whether the approaching person is legal or illegal by short range radio communication between portable terminals. In case that an illegal intruder is determined, warning is given to the illegal intruder. COPYRIGHT: (C)2006,JPO&NCIPI
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