| 摘要 |
PURPOSE:To prevent a file from being destroyed when a data output form is designated in error by discriminating whether or not a data exists on the data file, and outputting the data to the file depending on the result. CONSTITUTION:A file information management device 14 uses a table so as to manage files registered on a magnetic disk device 15 and searches a file information table 21 by using the inputted file name. A file discriminating device 16 gives a file name to a file management device 11 as information and when it is discriminated that no data is registered, the device 16 gives a command to a data input/output device 13 so as to output the data in a new data form and when the data is already registered, the device 16 gives a request to a parameter receiving device 17 so as to allow the device 17 to receive either new data form or an additional data form as a parameter. The parameter receiving device 17 displays the parameter on a parameter display device 18, receives the parameter and gives the result to a file presence discriminating device 16.
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