6. An apparatus for presenting information of document files, the document files being stored on a document database where the document files are categorized and stored into any of predefined category bins, the apparatus comprising: a selecting section that selects 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, the representative document files comprising a proper subset of the document files categorized in each respective object category bin associated with the representative document files; and a presenting section that presents information extracted from the selected representative document files to a user when the user queries contents of an object category bin of the object category bins without entering the object category bin, wherein the presenting section presents a guide caption describing keywords extracted from a file and obtained by a document summarizing process, and the presenting section increases a highlight contrast to a background for guide captions of files having greater weights regarding access histories.
6. An apparatus for presenting information of document files, the document files being stored on a document database where the document files are categorized and stored into any of predefined category bins, the apparatus comprising: a selecting section that selects 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, the representative document files comprising a proper subset of the document files categorized in each respective object category bin associated with the representative document files; and a presenting section that presents information extracted from the selected representative document files to a user when the user queries contents of an object category bin of the object category bins without entering the object category bin, wherein the presenting section presents a guide caption describing keywords extracted from a file and obtained by a document summarizing process, and the presenting section increases a highlight contrast to a background for guide captions of files having greater weights regarding access histories. 16. The apparatus for presenting information of document files according to claim 6 , wherein the selecting section calculates the following four calculated values: a difference between a time included in an access history of a file and a current time, a comparison of a day of the week of a date included in the access history and a current day of the week, a difference in days between the date included in the access history and a current date, a difference in months between the date in the access history and the current date, and the selecting section adds four weight values, corresponding to the four respective calculated values, each weight value being greater as the respective calculated value is smaller.