There is provided a method to print a composite image, by using a data processing apparatus, capable of generating first data, and an image forming apparatus, capable of generating second data and forming the composite image. The method includes providing one of a print instruction and a composition instruction to the data processing apparatus, setting a configuration of the second data, providing the one of the printing instruction and the composition instruction along with the first data to the image forming apparatus, reading and storing the second image, composing third data by combining the first data with the second data, judging whether the composition instruction is provided, pausing the printing operation when the composition instruction is provided, controlling reading the second image when the printing operation is paused, controlling the composition of the third data when the composition instruction is provided, and controlling forming the composite image.