Provided is a file (document) management process for efficiently understanding a summary of files in a folder without checking the contents of the individual subfolders or files. A summary of a plurality of files included in a folder is generated dynamically (each time the folder is accessed by placing a cursor on the folder, for example) and is displayed. For example, a summary of a feature of files included in a folder, which is recognized as being different from the feature of a plurality of files included in a sibling folder through comparison, determined on the basis of a feature or tendency of a file attribute, is described, and a location distribution of query-hit documents in the tiered folder is displayed.