The equipment operation which the user does not intend in the system which has the interface which utilizes the brain wave, is made to decrease. The adjusting device of brain wave identification method is used for the brain wave interface system. The organism signal measurement section which acquires the brain wave signal of the user and, each of the plural menu items which form the operation menu, through the output section, it presents the particular system, in systematic order, each menu item highlight after being done, it identifies making use of the specified identification method where it can decide the component of the phenomenon-related electric potential which is included in the brain wave signal beforehand it has possessed with the brain wave interface section which operates the equipment on the basis of the phenomenon-related electric potential which is identified. It has with the decision section which it decides that the menu item where as for the adjusting device, menu item highlight before being done, compares with the inclination and threshold of the ripple mark which calculated in the analysis section and the analysis section which calculate the inclination of the ripple mark of phenomenon-related electric potential, corresponds to inclination according to the relative result, is the menu item to which the user desires selection.
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