13. The automatic answering system according to claim 12 , wherein, when the conversation server determines that the conversation scenario does not includes a reply sentence corresponding to the user utterance accepted from the user, the conversation server transmits the user utterance in order to obtain a reply corresponding to the user utterance from an expert, receives data of a reply from the expert corresponding to the transmitted user utterance, transmits the received data of the reply from the expert to the conversation device, transmits a conversation log storing the inputted sentence corresponding to the user utterance, the data of the reply from the expert, and a reply sentence corresponding to the data of the reply from the expert, and receives and stores a conversation scenario generated based on the transmitted conversation log.
13. The automatic answering system according to claim 12 , wherein, when the conversation server determines that the conversation scenario does not includes a reply sentence corresponding to the user utterance accepted from the user, the conversation server transmits the user utterance in order to obtain a reply corresponding to the user utterance from an expert, receives data of a reply from the expert corresponding to the transmitted user utterance, transmits the received data of the reply from the expert to the conversation device, transmits a conversation log storing the inputted sentence corresponding to the user utterance, the data of the reply from the expert, and a reply sentence corresponding to the data of the reply from the expert, and receives and stores a conversation scenario generated based on the transmitted conversation log. 14. The automatic answering system according to claim 13 , further comprising: an expert side terminal device configured to receive the user utterance accepted from the user from the conversation server, to accept the reply from the expert to the received user utterance, and to transmit the data of the reply from the expert to the conversation server; and a conversation log database configured to receive, from the conversation server, the conversation log including the user utterance and the data of the reply from the expert transmitted from the expert side terminal device, and to store the conversation log, wherein the conversation scenario editing device generates the conversation scenario based on the user utterance and the data of the reply from the expert corresponding to the user utterance in the conversation log stored in the conversation log database, and transmits the generated conversation scenario to the conversation server.