An image forming apparatus for processing print data is disclosed. The image forming apparatus includes a control unit configured to control a plurality of nonvolatile storage devices having different transfer rates, and a determination unit configured to determine a nonvolatile storage device to store print data from among the plurality of nonvolatile storage devices based on information related to a size of the print data, information related to the transfer rates of the plurality of nonvolatile storage devices, and a threshold value depending on the number of sheets to be printed and output per unit time. The control unit and the determination unit are implemented by one or more processor.