1. A capsule endoscope image display controller that controls display of an image sequence including a plurality of images captured by a capsule endoscope which moves within digestive organs, said controller comprising: an image-to-image similarity calculating unit operable to calculate, for each image included in the image sequence, a similarity between the image and a temporally consecutive image; an amount-of-movement calculating unit operable to calculate, for each image included in the image sequence, an amount of movement of a feature area included in the image; a video state classifying unit operable to classify, for each image included in the image sequence, a video state of the image into one of a plurality of states including at least the following states, based on the similarity and the amount of movement of the image: (a) “stationary state” indicating that the capsule endoscope is stationary; (b) “digestive organs deformation state” indicating that the digestive organs are deformed; and (c) “capsule moving state” indicating that the capsule endoscope is moving; a rendering duration determining unit operable to determine, for each image included in the image sequence, a rendering duration between the image and the temporally consecutive image, based on the video state, the similarity, and the amount of movement of the image; and a display controlling unit operable to sequentially display, on a screen, the images included in the image sequence with the determined rendering durations.