PROBLEM TO BE SOLVED: To provide a KANA/KANJI conversion method, a KANA/KANJI conversion device, and a KANA/KANJI conversion program capable of maintaining a conversion processing speed at a high speed without requiring labor for KANA/KANJI conversion processing. SOLUTION: This KANA/KANJI conversion device 1 has a storage means for storing an input sign string dictionary for making an inputting sign string correspond to a specific word, and a connecting probability between words, and has an input means for inputting the sign string, a similarity score calculating means 3a for calculating a similarity score for expressing a similarity degree of these by comparing the sign string inputted by this input means with the word included in the input sign string dictionary, a KANJI conversion means 3c for converting the sign string inputted by the input means into a character string including a KANA and a KANJI by referring to the similarity score and a language model score based on the connecting probability of the word, and an output means for outputting the converted character string.
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