A digital image processing apparatus that detects a moving object included in an input image, establishes a shutter speed according to an amount of movement of the moving object, and performs a capturing operation based on the established shutter speed, and a method of controlling the digital image processing apparatus are provided. The method includes: receiving an input image; detecting a moving object in the input image; measuring an amount of movement of the moving object; and establishing a shutter time for a capturing operation according to the amount of movement of the moving object and according to at least one of: an established file size of an image to be captured or an established image size of the image to be captured.