An information processing system includes: an acquisition unit that obtains conversation data including speech information on a plurality of people; a textualization unit that converts into text the speech information in the conversation data; a confidential information acquisition unit that obtains information about a confidential target included in the conversation data; and a concealment unit that conceals a part of text of the conversation data on the basis of the information about the confidential target. According to such an information processing system, it is possible to properly conceal a part of the conversation data.