1. A control terminal comprising: an imaging unit configured to capture an image of a shooting area and to generate a first image; a shielding object detecting unit configured to detect a shielding object fixed to the control terminal, the shielding object shielding part of the shooting area; an operation detecting unit configured to detect a predetermined state of an object other than the shielding object or a predetermined motion of the object based on a second image after the shielding object is detected, the second image being an image of at least an area based on an image of the shielding object in the first image; and an output unit configured to output a control signal to a control target terminal when the predetermined state of the object or the predetermined motion of the object is detected.