An image processing apparatus includes a first processor core configured to allocate a plurality of threads to execute a drawing processing for converting printing object data divided into a plurality of units of printing to printing data, a plurality of second processor cores designated to execute data compression on the printing data converted by the drawing processing, and a storage device in which the compressed printing data are stored. The first processor core allocates a new thread to execute the drawing processing upon determining that the number of the second processor cores in an idle state is greater than the number of threads that are executing the drawing processing by a predetermined number.