1. An image processing apparatus comprising: an imaging operation state acquiring unit that acquires imaging operation state information representing imaging operation states at the time of an imaging operation for a plurality of images that are consecutively generated in a time series; an image processing unit that performs image processing, which is used for generating a synthesized image representing transition in a specific operation of an observed subject included in the plurality of images, based on the acquired imaging state information for the plurality of images; and an image synthesis unit that generates a synthesized image by synthesizing the plurality of images for which the image processing has been performed.