| 摘要 |
A notation character string division unit acquires a word to be processed from a word dictionary which includes a plurality of words each having notation information and pronunciation information, and divides its notation into a plurality of partial character strings. A partial character string coupling unit generates new partial character strings by coupling neighboring ones of the plurality of divided partial characters. A pronunciation rule generation unit determines pronunciations corresponding to the obtained partial character strings, and registers sets of partial character strings and pronunciations as pronunciation rules in a pronunciation rule holding unit. A pronunciation rule deletion unit deletes registered pronunciation rules on the basis of the frequencies of occurrence of pronunciation rules registered in the pronunciation rule holding unit.
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