| 摘要 |
A technology is provided of obtaining a retrieval result suited for a user' desire in a case of retrieving data expressed by the code system such as UNICODE in which techniques of expressing one character exist in plural. With registration data including a composing character or a compatibility character, a key item being included in the registration data, which should be made retrievable with a normalized retrieval key as well, is normalized, and is registered into a drawer, and the key item being included in the registration data, which should be made unretrievable, is registered into the drawer as it stands. At the time of retrieving data, in a case of desiring to retrieve data alone of which the key item coincides with that of the retrieval key, a user gives an designation for performing no normalization process to an option designator, and thereafter, inputs the retrieval key, and in a case of desiring to retrieve data as well of which the key item coincides with that of the normalized retrieval key, a user gives a designation for performing a normalization process, and thereafter, inputs the retrieval key. A retriever employs the retrieval key or the normalized retrieval key to retrieve data.
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