To obtain ambient sound velocity of a subject with high accuracy in a ultrasonic diagnosis apparatus. A semiconductor laser is connected to the input terminal of an input waveguide. A drive car has movable drive wheels for affirmatively engaging the track no matter the degree of curvature of the track. The shape changing unit performs a shape changing process collectively for the image elements of image-element group. In one embodiment, if the program logic is changed, a new user interface may be generated that works with the changed program logic. It is also determined whether the speaker is in the range of view for the user’s display.