A stiffened panel includes a panel at least one of whose surfaces is equipped with stiffeners each of which includes a base that is pressed against the surface of panel, as well as a core that is oriented orthogonally relative to the base and whose first longitudinal edge is integral to the latter. A cap forms a sealing space that is suctioned by a suction pump. The apparatus includes a display controller which controls whether or not to show the inclination guide display on the display device on the basis of the aspect ratio set by the aspect ratio setter. The perceptually significant features include color, texture andor shape. If the present invention is applied to CMOS transistor device, doping mask for the germanium plasma doping can be used. Characteristics of the adaptive filter are changed by using the error signal.