4. A printing apparatus comprising: a conversion unit configured to convert print data to print data corresponding to a plurality of areas; a generating unit configured to generate image data based on the print data convened by the conversion unit; a retaining unit configured to retain the print data converted by the conversion unit and the image data generated by the generating unit; a comparing unit configured to compare the print data retained at the retaining unit and the print data converted by the conversion unit; a selecting unit configured to select the image data retained at the retaining unit in case the print data converted by the conversion unit in response to the comparison by the comparing unit and the print data retained at the retaining unit correspond with each other, and select the image data generated by the generating unit in case the print data converted by the conversion unit in response to the comparison by the comparing unit and the print data retained at the retaining unit do not correspond with each other; and a printing unit configured to produce a print based on the formed image data for one page in the memory a pixel map selected by the selecting unit.
4. A printing apparatus comprising: a conversion unit configured to convert print data to print data corresponding to a plurality of areas; a generating unit configured to generate image data based on the print data convened by the conversion unit; a retaining unit configured to retain the print data converted by the conversion unit and the image data generated by the generating unit; a comparing unit configured to compare the print data retained at the retaining unit and the print data converted by the conversion unit; a selecting unit configured to select the image data retained at the retaining unit in case the print data converted by the conversion unit in response to the comparison by the comparing unit and the print data retained at the retaining unit correspond with each other, and select the image data generated by the generating unit in case the print data converted by the conversion unit in response to the comparison by the comparing unit and the print data retained at the retaining unit do not correspond with each other; and a printing unit configured to produce a print based on the formed image data for one page in the memory a pixel map selected by the selecting unit. 5. The printing apparatus according to claim 4 , wherein the area includes an area where one page is divided in two directions.