Patent ID: 7630654

Claim:
A printing apparatus, comprising: a plurality of chambers, adapted to accommodate a plurality of cartridges each containing toner to be used for printing; a mode changer, operable to change an operation mode of the printing apparatus in accordance with a combination of respective colors of toner in the cartridges accommodated in the chambers; a first detector, operable to detect a residual amount of toner in each of the cartridges; a second detector, operable to detect the respective colors of toner in the cartridges when the operation mode is changed; a controller, operable to generate an image data including a plurality of first identifiers each indicative of the residual amount of toner in one of the cartridges, and a plurality of second identifiers each indicative of one of the colors of toner and associated with one of the first identifiers; and a display, adapted to display the image data, wherein the controller is operable to calculate an average residual amount of toner in the cartridges when the second detector detects that the same color of toner is contained in all of the cartridges accommodated in the chambers; wherein the image data includes a third identifier indicative of the average residual amount; and wherein the third identifier can be displayed simultaneously with the first and second identifiers.