19. The operating method of claim 17 , further comprising: re-sending the original language voice speech signal to be interpreted to the first headset concurrently with or after outputting the corresponding interpreted voice signal to the second headset.
17. An operating method of a simultaneous interpretation system comprising a portable terminal and two or more headsets which communicate with each other by wire or by a wireless medium of the portable terminal, the method comprising: outputting, at the first headset, an original language voice speech signal to be interpreted to the portable terminal; acquiring, at the portable terminal, an interpreted language voice speech signal based on the original language voice speech signal received from the first headset; outputting, at the portable terminal, the acquired interpreted voice speech signal to the second headset; and outputting, at the second headset, the interpreted voice speech signal received from the portable terminal, wherein the portable terminal is configured to operate a short range wireless communication to communicate with the two or more headsets of a respective speaker and at least one listener in which the portable terminal translates between a plurality of pre-designated languages, and wirelessly communicates with an external interpretation server for translation between languages other than the plurality of pre-designated languages.