Provided are an information processing method, an information processing program, and an information processing device for copying or moving a file. The method includes a step for comparing file information and judging whether the file information coincide. The comparison element of the file information contains a file content. That is, the method includes: a step for comparing the file names of the copy source and copy destination or the movement source and the movement destination and judging whether a file of the same name exists in the copy destination or the movement destination; a step for comparing the file contents if a file of the same name exists in the copy destination or the movement destination so as to judge whether the file contents are identical; and a step for outputting the comparison results of the file contents.