Importance

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Abstract

Title information, which contains management information representing the kind or class of document information be recorded and index information representing the title and recording position of each document information, is provided for the recording and retrieving of the document information. When recording document information, title information is reproduced from an index information recording track of a magnetic tape and written in a title memory. A CPU executes an auxiliary decision as to if the management information of the reproduced title information corresponds to any of various management information preliminarily memorized, a first decision as to if the management information of document information newly applied from a keyboard corresponds to the various management information, and a second decision as to if the title applied from the keyboard coincides with a title in the title memory. The CPU inhibits the recording of document information at least one of the auxiliary decision and the first decision is unsatisfied and/or the second decision is satisfied.

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First Claim