DATA GENERALIZATION DEVICE, DATA GENERALIZATION METHOD, AND PROGRAM

摘要

A data generalization apparatus that can perform generalization processing on large-scale data at high speed using only a primary storage device of a small capacity is provided. A data generalization apparatus for generalizing attribute values includes: a rearrangement unit that rearranges the attribute values in a secondary storage device in accordance with an order of arrangement of the attribute values in a generalization hierarchy in the secondary storage device; an attribute value retrieval unit that retrieves some of the rearranged attribute values from the secondary storage device into a primary storage device; a generalization hierarchy retrieval unit that retrieves a portion of the generalization hierarchy from the secondary storage device into the primary storage device, the portion corresponding to the attribute values to be processed among the attribute values retrieved into the primary storage device; a generalization processing unit that executes generalization processing based on the attribute values retrieved into the primary storage device and the generalization hierarchy retrieved into the primary storage device; and a re-rearrangement unit that moves the attribute values after the generalization processing to the secondary storage device and rearranges them into an original order.