Abstract: A pig rearing support apparatus includes: an acquirer configured to acquire image data of an image captured by a camera unit installed facing a pen in which sows are raised in a group; a detector configured to detect mounting behavior of the sows based on the image of the image data; and a count processor configured to count the number of times the mounting behavior is detected within a preset observation period. Such a pig rearing support apparatus can inform a breeder at the right time without involving excessive cost or labor whether there is any sow that shows estrus symptoms among sows being raised in a group in a pen.