<p>A mobile body (1) with a superdirectivity speaker characterized by comprising an omnidirectional speaker (31) provided to the front of a body section (3) and adapted to produce sound to an unspecified number of people, a radiator (44) provided to a head section (4) and adapted to radiate an output signal generated by modulating a carrier signal of ultrasonic wave so as to transmit sound only to a specific object by ultrasonic wave parametric action, an object tracking system for sensing the surrounding space in real time by using signals from a visual module (200) and an auditory module (300), and a motor control module (400) for performing control by using a control signal from the tracking system so that the radiator (44) is opposed.</p>
