A computer program, method, and apparatus for determining key attribute items and search keywords for use in analysis of incident records. Master tables provide a collection of registered text strings which may appear in incident records. Upon entry of a specified keyword, a master table search processor searches the master tables to extract a master table containing the specified keyword, as well as identifying under which attribute item of the extracted master table the specified keyword is found. The identified attribute item is referred to as a key attribute item. Then out of the extracted master table, a search keyword extractor extracts every text string under the key attribute item for use as search keywords. With those search keywords, an attribute item information generator retrieves incident records and produces attribute item information from the retrieved incident records and the key attribute item.