1. A printing apparatus comprising: an input unit that inputs a print job containing image data of a plurality of pages; a printing unit that includes a transfer unit transferring a developer to a printing material and a fixing unit fixing the transferred developer to the printing material, and executes a printing process for a plurality of types of printing materials based on the print job; an extraction unit that extracts a type of printing material used in the printing process based on the print job; a determination unit that, in a case where the extraction unit extracts a plurality of types, determines whether a set value common to the plurality of types of printing materials can be used for fixing control in the fixing unit when executing the printing process for the plurality of extracted types of printing materials; a decision unit that, in a case where the determination unit determines that the common set value can be used for the fixing control, decides a set value common to the plurality of types of printing materials used in the printing process based on the print job, and in a case where the determination unit determines that the common set value cannot be used for the fixing control, decides a plurality of set values for the respective types of printing materials used in the printing process based on the print job; and an execution unit that executes the fixing control in the fixing unit in accordance with the set value decided by the decision unit.