PURPOSE:To make it possible to form the voice of a person to be remarked on a center or to form a sound image on a position required by a listener in each conference talking by providing the conference service terminal equipment with a means for setting up and changing the sound image position of an originating speaker by listener's operation and a means for exchanging receiving control information in accordance with the set point of the setting/ changing means. CONSTITUTION:A both-ear receiver provided with two electroacoustic conversion means 10r, 10l corresponding to both the ears of a person generates a sound image set up on a different position in each originating conference terminal equipment. In this case, the sound image position can be optionally changed by the manual operation of a listener. Namely, a switching control circuit 3 converts speaking source control information in accordance with sound image formation control input information and supplies the converted information to sound image fixed position switching circuits 4, 6 as sound image formation control output information. Thereby, the announcing position of a person to be remarked e.g. can be moved to a position required by the listener.
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