1. An image extraction device, comprising: an instruction acquisition unit that acquires an instruction input by a user; an image group selection unit that selects a second image group, which has a smaller number of images than a first image group, from the first image group in response to the instruction; an extraction reference determination unit that determines an image extraction reference when extracting an image from the second image group based on images included in the first image group; and an image extraction unit that extracts one or more images, the number of which is smaller than the number of images in the second image group, from the second image group according to the image extraction reference.