And customer interactions data storage unit of the past that stores customer interactions data indicating the answering result an input unit for inputting customer interactions data of answering during, and past customers, customer interactions analysis system, failure / accident-related customer interactions data and homogeneous customer interactions data search unit that searches as homogeneous customer interactions data from customer interactions data storage unit of the past customer interactions data, including past at a high rate, and the same kind customers the contents of the customer interactions and data list storage unit, of answering in homogeneous customer interactions each data, and extracting customer interactions unconfirmed content extraction unit the contents of the unidentified inclusion nor deny have not been to the contents of the customer interactions data of answering in from answering data, the contents of the unidentified customer interactions data of answering in I and a customer interactions unconfirmed contents presentation section for presenting to the answering person together with information on the accident or failure.
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