1. An image processing apparatus comprising: an acquisition unit configured to acquire movie data, wherein the movie data includes multiple-outline-removed images obtained by outline burring processing on captured images and includes difference images obtained based on differences between the captured images and the multiple-outline-removed images; an instruction acquisition unit configured to acquire an instruction which indicates which of a motion blur-removed image and a multiple-outline-removed image is to be displayed; a first output unit configured to output, in a case where the acquired instruction indicates that the multiple-outline-removed image is to be displayed, the multiple-outline-removed images included in the movie data; and a second output unit configured to generate, in a case where the acquired instruction indicates that the motion blur-removed image is to be displayed, the motion blur-removed images based on the difference images and the multiple-outline-removed images and outputs the generated motion blur-removed images.