An information processing device includes: an image acquiring section that acquires image data of an image of a plant； a form recognizing section that recognizes at least either (i) a shape of the plant or (ii) an end portion of the plant, based on the image data acquired by the image acquiring section； and a deciding section that decides at least one of (a) a level of water content in a medium of the plant, (b) whether water-supply to the plant is necessary or not, and (c) an amount of water-supply to the plant, based on a feature of at least either the shape of the plant or the end portion of the plant that is recognized by the form recognizing section.
