An image selection support device supports the selection of a still image based on captured image data obtained by an endoscope. By using a first still image acquired based on the captured image data at a time when an operator of the endoscope performs an acquisition operation of the still image, and one or more second still images acquired from the captured image data at a time different from the time when the acquisition operation is performed, the image selection support device extracts a third still image having an imaging time point that satisfies a predetermined condition with an imaging time point of the first still image from among the second still images, and associates the first still image with the third still image.