PURPOSE: To eliminate the need of reforming a file in a computer mainbody and to reduce the burden of the computer mainbody by tentatively storing the specified part of the file in the list output of the file.
CONSTITUTION: A file data input means 1-1 inputs filing data and filing data tentative storage means 1-2 stores tentatively inputted filing data. An output interface device 1-5 files the data which is tentatively stored in the filing data tentative storage means 1-2. A page designation input means 1-4 inputs the page designation of outputted filing data and an output control means 1-3 controls respective means 1-1, 1-2, 1-4 and 1-5. Thus, it becomes unnecessary to reform the file in the computer mainbody and the load of the computer mainbody can be reduced.