Provided is a method for interpretation and translation accomplished by an interpretation and translation apparatus of a user through interfacing with an interpretation and translation apparatus of the other party. The method includes: automatically setting a translation target language which enables to communicate with the other party based on a message from the interpretation and translation apparatus of the other party by using a communication connection in a network; receiving input information of a use language of the user; calling a translator corresponding to the translation target language to transmit a result obtained by translating the input information into the translation target language to the interpretation and translation apparatus of the other party; and outputting received data from the interpretation and translation apparatus of the other party or outputting the result obtained by translating the received data into the use language of the user by using the translator.