INTERFACE CONTROL SYSTEM, INTERFACE CONTROL APPARATUS, INTERFACE CONTROL METHOD, AND PROGRAM

An interface control system (2000) includes a first marker detection unit (2020) and a display control unit (2040). The first marker detection unit (2020) detects a first marker (50) attached to the body of a user based on a captured image obtained from a camera (20) worn by the user. The display control unit (2040) displays an operation image on a display screen (32) of a head mounted display 30 mounted on the user based on the first marker detected by the first marker detection unit (2020). The display control unit (2040) displays the operation image so that the operation image is viewed to be superimposed on the arm portion of the user when viewed with the eyes of the user.