To provide a visitor/leaver number managing device for counting the number of visitors/leavers with high precision even when any temporary communication error is generated between a detecting unit which detects visitors/leavers and a managing unit which manages the number of visitors/leavers.
A detecting unit 10 counts the cumulative number of visitors/ leavers since start, and periodically outputs the number of visitors/leavers as detection data Xm and Ym by radio. A managing unit 11 receives the detection data Xm and Ym by radio, and updates and stores the data as new management data Xn and Yn. Therefore, the detecting unit 10 itself counts the cumulative number of visitors/leavers Xm and Ym, and transmits the data to the managing unit 11 so that even when errors are generated in radio communication several times in the management period, the correct cumulative number of visitors/ leavers Xm and Ym can be transmitted from the managing unit 11 to the detecting unit 10, and the number of visitors/leavers can be counted with high precision.
IMAI TAKAYUKI
TSUDA HIROAKI
OSHIMA MITSUTOSHI
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