To make it easy to recognize whether each person is in a situation in which the person may catch an infectious disease, the present invention provides an information output apparatus 10 including an acquisition unit 11 that acquires a captured image acquired by photographing a space, a detection unit 12 that detects a person from the captured image, a determination unit 13 that determines a radius of a circle to be displayed over the captured image in an overlapping manner according to a predetermined condition, and a display control unit 15 that displays an image in which a circle surrounding each of the detected persons is displayed over the captured image in an overlapping manner.