1 : An information processing system, comprising: image data obtaining means for obtaining text-including image data comprising text data and image data for displaying a text-including image in which a text indicated by the text data is superimposed on an image indicated by the image data; converted text obtaining means for obtaining converted text data resulting from conversion of the text data comprised in the text-including image data; replacement means for replacing the text data comprised in the image data by the converted text data; and display control means for causing a client to display a text-including image in which a text indicated by the replaced text data is superimposed on the image indicated by the image data, based on text-including image data including the replaced text data and the image data.