An interface device in accordance with the present claimed invention is an interface device (4) that intervenes between a measuring means (2) that measures brain activities of a subject ( H ) and an object (31) to be controlled, and that comprises a reference signal storing part (D1) that stores a brain activity signal measured at a time when the subject ( H ) conducts predetermined thinking different from direct thinking in order to control the object (31) to be controlled in a desired mode as a reference signal, a discriminating part (41) that compares the brain activity signal measured by the measuring means (2) with the reference signal and discriminates whether or not the thinking of the subject ( H ) is the predetermined thinking, and a controlling part (42) that controls the object (31) to be controlled in the desired mode when the discriminating part (41) discriminates that the thinking of the subject ( H ) is the predetermined thinking.
Interface device, interface method and control training device