A directivity control method is provided for controlling a directivity of a sound collected by a first sound collector including a plurality of microphones. The directivity control method includes: forming a directivity of the sound in a direction toward a monitoring target corresponding to a first designated position in an image displayed on a display; obtaining information on a second designated position in the image displayed on the display, designated in accordance with a movement of the monitoring target, and changing the directivity of the sound toward the monitoring target corresponding to the second designated position by referring to the information on the second designated position.