Exceeding a data bus limit is prevented by selecting a data transfer rate based on a color reading setting and other reading settings. An image processing apparatus including a reading unit configured to read a document, an image processing unit configured to process image data generated by reading the document with the reading unit, and a transfer unit configured to transfer the image data from the reading unit to the image processing unit further includes a reception unit configured to receive a color reading setting indicating whether the reading unit reads the document in color or monochrome and other reading settings and a selection unit configured to select an image data transfer rate of the transfer unit based on the color reading setting and the other reading setting received by the reception unit.