To provide an interaction device which can perform interactive processing with an user at a high speed, even when an unexpected document is inputted.

When the user inputs a conversation sentence (YES at S13), words are extracted from the input conversation sentence and word vectors corresponding to the extracted words are summed up to generate an input conversation sentence vector (S14). For a prepared answer conversation sentence, word extraction and addition of word vectors are likewise performed to generate an interaction script vector (S15). The interaction script vector, having the direction which is the most similar to the direction of the input conversation vector, is found (S16). An answer conversation sentence corresponding to the interaction script vector is outputted (S17).