a first input unit configured to input first image data;

a second input unit configured to input second image data;

an adding unit configured to divide each of the input first and second image data into several blocks, and add attribute data showing an attribute to each of the input first and second image data to each block;

a storage unit configured to store the first and second image data to which the attribute data is added;

an editing unit configured to read the stored first and second image data, perform layout editing to mix and lay out the first and second image data in one page, and cause the storage unit to store the first and second image data again;

a read unit configured to read, per block, the first and second image data laid out in one page, stored in the storage unit and added with the attribute data;

an analysis unit configured to analyze an attribute of each block based on each attribute data of the first and second image data read per block by the read unit;

an image processing unit configured to carry out first image processing with respect to the block of the first image data read by the read unit while carrying out second image processing with respect to the block of the second image data read by the read unit in accordance with each of the analyzed attributes; and

a synthesis unit configured to synthesize the image-processed blocks of the first and second image data into one page.