There is provision of an information presentation device including a displaying unit, an input receiving unit configured to receive an input from a user, an answer generating unit configured to generate an answer sentence in response to the input received by the input receiving unit, an additional information acquiring unit configured to acquire additional information related to a word contained in the answer sentence generated by the answer generating unit, a voice outputting unit configured to output the answer sentence by sound, and an information outputting unit configured to output the additional information on the displaying unit.