Motion information of a tissue at a plurality of positions in a subject to be examined which is obtained by transmissionreception of an ultrasonic wave is acquired. For each of the potential features, an approximate model is learned by holding values of the existing features in the model constant. When an operation surface of the operation substrate is pressed, the connection portion rotates in a direction and the upper elastic portion and the lower elastic portion of the elastic body are compressed, whereby an appropriate operation reaction force and an elastic return force can be exerted. Moreover, the coordination and control logic further can include a coupling to browser settings for the content browser to selectively enable and disable the slider track based upon the browser settings.