The colony image inspection apparatus (10) acquires images photographed for each of three or more petri dishes cultured to inspect the same kind of bacterial colonies. Further, the colony image inspection apparatus (10) calculates the similarity between the acquired three or more images. Further, the colony image inspection apparatus (10) selects two images indicating that similarity is not the most similar among three or more images. Further, the colony image inspection apparatus (10) outputs the selected two images as images arranged side by side.
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