A computer-readable computer program product that contains a data file outputting program for causing a computer to execute: a read-in instruction for reading in a plurality of data groups from a storage medium having recorded therein in correlation to each other post-edition data, pre-edition data and edition history data, and each of the plurality of data groups including the post-edition data, the pre-edition data, and the edition history data in correlation to each other, one group after another; a data creation instruction for applying, for each of the plurality of data groups, a content of edition at each point in time of edition to the pre-edition data based on the edition history data to create edition process data at each point in time; and a file output instruction for outputting in batch the post-edition data, the pre-edition data, and the edition process data as different data files, respectively.