1. A storage medium readable by a computer, the storage medium storing a program for causing a computer connected to a document database where document files are categorized and stored into any of predefined category bins to perform a process comprising: selecting at least some of document files stored on the document database and categorized in object category bins as representative document files for each of the object category bins, the object category bins being at least part of the category bins; and presenting information relating to the selected representative document files to a user.