A digital image processing apparatus and a method of controlling the same are provided. The method of controlling an image plane phase difference digital image processing apparatus, the method includes, in a continuous photographing mode for continuously capturing still images, performing a first focus detection by detecting phase difference of an image captured during a first image capture; performing a second focus detection by detecting phase difference of an image captured during a second image capture; determining moving speed of an object based on results of the first focus detection and the second focus detection; and correcting focus location by driving a focusing lens based on the determined moving speed of the object.