An image processing apparatus includes an input control unit, a processing unit, an output control unit, a first sending unit, and a second sending unit. When an output request including a unique identifier and a data generation condition of image data is received, the first sending unit writes the image data corresponding to the unique identifier in the processing unit. The processing unit compares the image data written by the first sending unit with the data generation condition thereby determining a processing condition, processes the image data based on the processing condition, and outputs the processed image data to the output control unit via the second sending unit.