A marker (3020) is any part of a user's body or is any mark attached to the user. A sensor (3040) is attached to the user. An operation region calculation unit (2020) calculates an operation region included in a captured image on the basis of a position of the marker (3020) included in the captured image generated by a camera. A recognition unit (2040) calculates a position or motion of an operation body captured in the operation region, and recognizes an input operation on the basis of the calculated position or motion of the operation body. Note that the recognition unit (2040) calculates a position of the operation body captured in the operation region at a timing based on a result of detection by the sensor (3040). The recognition unit (2040) calculates motion of the operation body captured in the operation region in a period including a timing based on a result of detection by the sensor (3040).