| 摘要 |
An area specifying apparatus, which is portable, includes a position acquiring unit that acquires positions of respective radio communication apparatuses through radio communication therewith, a distance measuring unit that measures distances from the area specifying apparatus to the respective radio communication apparatuses while the area specifying apparatus is being moved, a position calculating unit that calculates positions of the area specifying apparatus based on three or more of the positions of the respective radio communication apparatuses and corresponding three or more of the distances from the area specifying apparatus to the respective radio communication apparatuses, and a position transmitting unit that transmits the positions of the area specifying apparatus to each of the radio communication apparatuses so that each of the radio communication apparatuses can specify a physical area enclosed by a line connecting the positions of the area specifying apparatus as a specified area.
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