This apparatus, method, and program, from a plurality of records each record including position information showing a position in a two or more-dimensional space and a plurality of attribute information pieces, finds a condition of attribute information under which records are congested in the space, including: selecting records having same attribute information piece from the plurality of records for each of attribute information pieces; storing the attribute information piece in case where the records selected satisfy a predetermined congestion condition based on the position information of the records selected; combining attribute information pieces stored among different attributes to generate a combination of attribute information pieces; selecting records having the combination of attribute information pieces from the plurality of records; and storing the combination of attribute information pieces in case where the records selected satisfy the predetermined congestion condition based on the position information of the records selected.
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