1. An image processing apparatus comprising: a scene transition detection unit for detecting a scene transition in a moving image based on data of the moving image including a series of images; a representative image extraction unit for extracting a predetermined number of representative images from a series of images belonging to each scene; a representative image classification unit for, when two or more representative images are extracted from each scene, classifying the representative images into a main image and a sub-image; a degraded display image generation unit for generating a degraded display image by operating the sub-image in order to degrade and display the sub-image; and a representative image display unit for displaying the representative images of a plurality of scenes side by side in a scene transition sequence, and displaying the main image and the degraded display image when two or more representative images are extracted from each scene and the representative image when one representative image is extracted from each scene.