1. An information processing system, comprising at least one processor; and at least one memory device that stores a plurality of instructions, which when executed by the at least one processor, causes the at least one processor to operate to: obtain document data which indicates a document; obtain 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, the text-including image data indicating an image arranged in the document; determine whether or not the document data is translated based on a referrer of the document data; obtain, when the determination indicates that the document data is translated, an original language and a target translated language; cause a conversion system to convert the text data comprised in the text-including image data based on the original language and the target translated language; obtain converted text data resulting from conversion of the text data; replace the text data comprised in the image data by the converted text data; and cause 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.