It detects person 204 with observation device, 101 stores the detection log of the person in human detection log database, 102 presuming the position where the person is for the first time detected with the first detection position presumption means, 103 it stores in the first detection position log database, 104 presumes the position in local coordinate of door 205 of room 201 Out with entrance position presumption means, 105 in local coordinate and global coordinate it calculates the information of proofreading the position of the observation device with position proofreading information calculation means 106 on the basis of door position.
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