an ink jet printing apparatus including : a print unit having a polarity of ejection outlet arrays , for ejecting ink ,; a scan unit for scanningly moving the print unit relative to the print medium in a main scan direction ; and a feed unit for feeding the print medium relative to the print unit in a direction which is different from the main scan direction , wherein an image is formed on the print medium while repeating a scanning operation of the scanning unit and a feeding operation by the feeding unit . the apparatus also includes an information obtaining unit for obtaining image information ; and a selecting unit for selecting at least one of the ejection outlet arrays to effect printing for the image data in a predetermined area , on the basis of the information obtained by the information obtain unit about image formations .