1. A document processing device, comprising: document image holding means for holding inputted documents as digital images; chart area extracting means for extracting areas of charts included in document images held by said document image holding means; chart area dividing means for dividing a chart area extracted by said chart area extracting means into elements and for extracting a type from a plurality of predefined types and a coordinate value of each element; element attribute providing means for determining, for each of the elements divided by said chart area dividing means, positional relation with respect to a whole chart in accordance with the coordinate value of each element and for providing said positional relation as an element attribute, said element attribute providing means providing a number based on the type of element to each element; output image forming means for extracting image data corresponding to each element and for forming an output image by coloring image data corresponding to each element identified by an element attribute in accordance with a parameter value, said parameter value corresponding to each element attribute of a color arrangement parameter table; and visualizing means for visualizing a document image formed by output image forming means on a visualizing medium.