An interaction history management device (200) includes an interaction control unit configured to accept an input of an operation by audio and generate a reply by audio in response to the operation, an interaction history storage unit (233) configured to store information that identifies an audio content of the accepted operation and information that identifies an audio content of the reply, an execution unit configured to store an identifier to the interaction history storage unit (233) as associating with the reply when a predetermined process related to the accepted operation is executed normally, and an external data deletion unit (280) configured to, when an instruction to delete information used in the predetermined process is accepted, delete the information, identify an identifier of the predetermined process in which the information to be deleted is used, and delete at least the audio content of the reply associated with the identifier from the interaction history storage unit (233).
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