The present invention relates to a voice information service system to be connected onto an ATM network. An object of the present invention is to solve the problem that the installation cost of a voice information service system increases proportionally to the number of channels and to provide an inexpensive voice information service system. The voice information service system includes a voice buffer for temporarily storing voice information with a given length read from a voice file for storing digitized voice information, and a cell assembler for appending an SAR header and cell header to voice information existent in the voice buffer. A control unit includes a cell control table for storing cell control information associated with a plurality of virtual channels, controls calls by transmitting or receiving control signals onto or from the ATM network via a signal cell assembler dissembler, references areas associated with an available virtual channel in the cell control table upon call termination, produces a voice cell to be placed on the virtual channel at regular intervals using the cell assembler and cell control table, and then transmits the voice cell to a calling side.