1. An image processing apparatus for sequentially displaying time-series images, comprising: a movement-direction-change image extracting unit that detects a movement between consecutive images constituting the time-series images and extracts an image of the consecutive images in which a movement direction is changed in comparison to a respective movement in a previous image of the consecutive images; and a display speed controller that controls display speeds of the image extracted by the movement-direction-change image extracting unit and images adjacent to the image at a level relatively lower than display speeds of other images.