9. A computer comprising: a file attribute obtaining unit which obtains 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; a document icon generator for generating a document icon associated with the document file, the generated document icon including a thumbnail image of the document file and a region percentage display image, the thumbnail image of the document file being a color representation of the document file when the obtained color attribute information indicates that the document file is expressed in color, 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; and a display which displays the generated document icon associated with the document file.
9. A computer comprising: a file attribute obtaining unit which obtains 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; a document icon generator for generating a document icon associated with the document file, the generated document icon including a thumbnail image of the document file and a region percentage display image, the thumbnail image of the document file being a color representation of the document file when the obtained color attribute information indicates that the document file is expressed in color, 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; and a display which displays the generated document icon associated with the document file. 10. The computer according to claim 9 , wherein the thumbnail image of the document file being a monochrome representation of the document file when the obtained color attribute information indicates that the document file is not expressed in color.