7. The method as described in claim 6 , wherein the visualizing further comprises assigning the color to the patent document according to a color model, having two input components whose mixture produces said color when the patent document is characterized by two patent indices, or having three input components whose mixture produces said color when the patent document is characterized by three patent indices, wherein values of the components of the color model are equal to the respective values of patent indices.
7. The method as described in claim 6 , wherein the visualizing further comprises assigning the color to the patent document according to a color model, having two input components whose mixture produces said color when the patent document is characterized by two patent indices, or having three input components whose mixture produces said color when the patent document is characterized by three patent indices, wherein values of the components of the color model are equal to the respective values of patent indices. 9. The method as described in claim 7 , wherein the color model is one of the following: CMY (Cyan, Magenta, Yellow), HSV (Hue, Saturation, Value), HLS (Hue, Lightness, Saturation), XYZ model, L*u*v* model, or L*a*b* model defined by Commission Internationale de l'Eclairage (CIE), France.