1 : An information processing system, comprising: acquisition means for acquiring a plurality of converted character strings one by one, each of the plurality of converted character strings having been converted from a corresponding one of a plurality of original character strings, each of the plurality of original character strings being included in at least any one of one or more original images; generation means for generating, each time one of the plurality of converted character strings is acquired, a converted image in which the acquired converted character string is arranged in an area corresponding to a display area of the original character string corresponding to the acquired converted character string in the original image including the original character string; and changing means for changing, on a display device displaying at least a part of an object including one or more images on a screen based on display information, a content of a foreground of an arrangement area of the original image corresponding to the converted image generated by the generation means in the object to the converted image.