14. A method executed in a computer comprising: obtaining color attribute information of a document file, the color attribute information including information indicating whether the document file is expressed in color, the color attribute information including information indicating a percentage of a color region contained in the document file; and displaying a document icon which represents the document file, the document icon including a thumbnail image of the document file and a region percentage display image, the thumbnail image of the document file being displayed in color when the obtained color attribute information indicates that the document file is expressed in color and the region percentage display image being an image of a graph representing the percentage of the color region in the document file in accordance with the obtained color attribute information.
14. A method executed in a computer comprising: obtaining color attribute information of a document file, the color attribute information including information indicating whether the document file is expressed in color, the color attribute information including information indicating a percentage of a color region contained in the document file; and displaying a document icon which represents the document file, the document icon including a thumbnail image of the document file and a region percentage display image, the thumbnail image of the document file being displayed in color when the obtained color attribute information indicates that the document file is expressed in color and the region percentage display image being an image of a graph representing the percentage of the color region in the document file in accordance with the obtained color attribute information. 15. The method according to claim 14 , wherein the thumbnail image of the document file being displayed in monochrome when the obtained color attribute information indicates that the document file is not expressed in color.