The missing area specifying unit (23) specifies, in the assigned area assigned to the assigned sensor for detecting the position, a missing area that is not detected in the assigned data that is sensor data acquired by the assigned sensor. The interpolation data extraction unit (24) extracts sensor data obtained by detecting a missing region and acquired by a sensor other than the assigned sensor as interpolation data. The detection data generation unit (26) integrates the assigned data and the interpolation data to generate detected data for the assigned area.
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