PURPOSE: To make the display of the extraction process of extracted data easy to understand by displaying the process of data extracted in accordance with an extraction condition from original data in hierarchical structure.

CONSTITUTION: This device is provided with a retrieving processing part 13 extracting data in accordance with the extraction condition specified from specified original data 17, a hierarchizing processing part 14 which generates hierarchical structure by repeating arranging original data 17 at a root node, arranging data extracted from one or plural pieces of arranged data by the retrieving processing part 13 as the node of high-order hierarchy and connecting both nodes, and a display processing part 15 displaying hierarchical structure generated by the hierarchizing processing part 14.