In the present invention, a missing area specification unit (23) specifies, in a designated area assigned to a designated sensor for position detection, a missing area that has not been detected in designated data that is the sensor data that has been acquired by the designated sensor. A supplementary data extraction unit (24) extracts, as supplementary data, sensor data that has been acquired by a sensor other than the designated sensor and in which the missing area has been detected. A detection data generation unit (26) generates detection data for the designated area by integrating the designated data and supplementary data.
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