A teleconference device includes a function as a transmitter unit and a receiver unit. The transmitter unit transmits an audio signal formed from a sound collection signal of a microphone array Mi (i = 1 to N) and position information. The position information forms a plurality of sound collection beams directed to a particular direction and selects the sound collection beam of the maximum sound volume. In the receiver unit, a parameter calculation unit sets a virtual sound source according to the received signal data and sets a delay parameter. A virtual sound source generation signal processing unit forms a sound emission beam according to the parameters and outputs it to a speaker SPi.