1. An image processing device comprising: an image frame determination unit configured to acquire a plurality of image frames, a first portion of the plurality of image frames having a first imaging rate and a second portion of the plurality of image frames having a second imaging rate, determine when a change in a displaying rate of the plurality of image frames is to occur based on a change between the first portion of the plurality of image frames having the first imaging rate and the second portion of the plurality of image frames having the second imaging rate; and a displaying rate adjustment unit configured to transition the displaying rate of the plurality of image frames from a first displaying rate to a second displaying rate during a predetermined period, the predetermined period having a beginning or an end that occurs when the change between the first portion of the plurality of image frames and the second portion of the plurality of image frames is to occur.