Language conversion rule preparing device, language conversion device and program recording medium

A language transference rule producing apparatus characterized in that said apparatus comprises:

• a parallel-translation corpus;
• a phrase extracting section which calculates a frequency of adjacency of words or parts of speech in a source language sentence and a target language sentence in said parallel-translation corpus, and couples words and parts of speech of a high frequency of adjacency to extract partial sentences in each of which semantic consistency is formed;
• a phrase determining section which, among the partial sentences extracted by said phrase extracting section, checks relationships between the partial sentences of the source language and the target language with respect to a whole of a sentence to determine corresponding partial sentences;
• a phrase dictionary which stores the determined corresponding partial phrases,
• said phrase dictionary is used when language transference is performed, and the language transference, when a source language sentence is input, matches the input sentence with the corresponding partial phrases stored in said phrase dictionary, thereby performing language or style transference;
• a morphological analyzing section which transfers the source language sentence of the parallel-translation corpus into a word string;
• and
• a semantic coding section which, by using a result of said morphological analyzing section, on a basis of a table in which words are classified while deeming words that are semantically similar, to be in a same class, and a same code is given to words in a same class, produces a parallel-translation corpus in which words of a part or all of the source language sentence and the target language sentence are replaced with codes of the classified vocabulary table, and
• said phrase extracting section extracts phrases from the parallel-translation corpus in which words are replaced with codes by said semantic coding section.