A virtual space management unit 60 generates a virtual space information and manages the virtual space information. An icon position acquisition unit 61 acquires icon position information of each of the users U. A transmission-side voice acquisition unit 62 acquires a transmission-side voice information. A distance calculation unit 63 calculates a distance between each of the icons based on a position within the virtual space of the icons corresponding to each of the users U. A correction factor determination unit 64 determines a correction factor of an output information based on the distance between the icons calculated by the distance calculation unit 63. A reception-side voice transmission control unit 65 transmits the acquired transmission-side voice information and the determined correction factor to each of the second user terminals 3.