An apparatus and method of ink jet printing is provided that poor ejection less occurs even where making a printing on a printing medium ready to cause a paper powder, such as a fine art paper. An image is to be printed on a printing medium by performing a relative movement of a printing medium and a printing head having a plurality of arrays each having a plurality of ejection openings. On this occasion, the image is printed by using ejection openings in a number changed in accordance with a type of the printing medium, out of a plurality of ejection openings on the two arrays adjacent to each other.