PURPOSE:To easily define and alter a format by detecting a format identifier, retrieving the format data corresponding to it in a format data file, and generating a format image defined in format image data according to control data. CONSTITUTION:Substitution data are obtained from a substitution data file 4 and the format of the substitution data to be edited is found. The format data file 3 is retrieved through a format data acquiring process and format data are stored in a format storage area 7 by line identifiers. In a header editing process, an index part is edited on the basis of the format data which are stored by the line identifiers and outputted to the output area of a main memory 9. After the header editing process, substitution line information as data on one logical line is cut from the substitution indication of the substitution data, and, when there is the object substiution line information, a detailed part is edited and next substitution line information is cut. Then, advance to the header editing process is made and the header part of the format data is edited and outputted to the output area.
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