1. An image processing apparatus for estimating a position in an image which an operator who observes the image is likely to observe as a candidate of a next position, the apparatus comprising: a next observation estimator that estimates a position selected from among a plurality of positions using a parameter indicating an operation history and information regarding an estimation result at least at a current time on the basis of a probability value obtained from a predetermined probability distribution; and a displayed image generator that generates an image to be displayed so that at least the candidate of the next position is visually recognizable.