A digital-to-analog conversion circuit of charge distribution type includes a plurality of capacitors having respective capacitances that increase in a sequential order, one end of the capacitors being commonly connected electrically. This server can also support secure object storage, which stores serialized, secure signed, compressed objects for delivery to the card or for off-loading from the card. Upon receiving the transformed information, the receiving apparatus retrieves the intermediate language information from the received transformed data, and carries out an operation of voice synthesis on the basis of the retrieved intermediate language information and outputs the synthesized voice. The other end of the sheath is formed with a through hole through which the adapter can outward protrude.