Disclosed are a printing apparatus for executing print processing based upon print data and a method of controlling this apparatus. The print data is saved in a first memory area, the print data, which has been saved in the first memory area, is rendered into image data, the rendered image data is stored in a second memory area, and printing is performed using the image data. A determination is made as to whether the image data, which has been stored in the second memory area, is to be saved for the purpose of reprint process.