The information processing system according to one embodiment includes a specifying unit and an extraction unit. The specifying unit specifies a content word co-occurring with onomatopoeia in one review among a plurality of posted reviews stored in a storage unit. The extraction unit extracts a posted sentence containing the content word from the plurality of posted reviews. In general, posted sentences or posted reviews containing onomatopoeia are likely to include users' actual experiences. By extracting the posted sentences that contain the content word which is likely to co-occur with onomatopoeia, it is possible to effectively extract the posted sentences on which users' actual experiences are written.