The objective of the present invention is to make it possible to select and train a brain region appropriate for causing a body part to function. A biometric information processing device 1 is provided with a brain wave detecting unit 10, a control unit 20, and a movement assisting unit 30. The brain wave detecting unit 10 detects biometric information in at least one brain region from among a plurality of brain regions that can be selected in accordance with the body part for which function is to be recovered or improved. On the basis of the biometric information in the brain region detected by the brain wave detecting unit 10, the control unit 20 determines a brain activity state, including the location of a brain region that is activated in a subject who attempts to move the body part, and the level to which the brain region is activated. When the control unit 20 determines that the brain activity state conforms to predetermined conditions, the movement assisting unit 30 executes a predetermined movement.
