PURPOSE: To prevent the breakdown of a data caused by an operation error, by defining the retrieval information peculiar to a storage medium, executing in advance its collation, and thereafter, executing an information processing.
CONSTITUTION: Retrieval use information (ID information) peculiar to an information storage medium 11 is stored in advance in a prescribed storage area of the medium concerned. On the other hand, in an information processor body, ID information of the storage medium of an object is stored as current ID information, in a prescribed area of a memory 15 before starting the processing. In this state, when the information storage medium 11 has been installed, a collation of the ID information which has been stored therein, and the current ID information which has been stored in the memory 15 of the body is executed, and after it has been decided that the installed medium is the object storage medium, a desired information processing is executed.
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