To provide a technique for generating an easily readable data file when outputting a data file including a plurality of kinds of scan data generated from a plurality of scan objects.

A data processor includes a character size detecting means, a size changing means, and a data file generating means. The character size detecting means detects the size of characters included in scan data concerning the respective kinds of scan data. The size changing means changes the size of the scan data by a magnification/reduction ratio allowing the size of the characters included in the respective kinds of scan data to be the first prescribed character size (S60). The data file generating means generates the data file for outputting an image where the plurality of kinds of scan data including the scan data, whose size is changed by the size changing means, are arranged.