1. An input apparatus, comprising: an infrared camera; an image capture unit configured to sequentially capture a plurality of temperature distribution images photographed at predetermined time intervals by the infrared camera; and an input recognition unit configured to detect, from among the plurality of temperature distribution images captured by the image capture unit, pairs of skin temperature image portions each corresponding to a temperature of skin of a person, to recognize, from among the pairs of skin temperature image portions detected, pairs of skin temperature image portions as pairs of detection target images, from among which motions are observed, and to recognize an operation input based on states of the motions of the pairs of detection target images.