The translation program size and the processing time are reduced. A text data structure is composed by arranging character code data on characters which include at least ideographic characters and the type of which can be identified. The text data structure contains together with the character code data, segment identifying data for identifying character code data included in each segment after conversion by a conversion program which converts an inputted phonographic character string into a character string including an ideographic character on the basis of information on segment which are units of conversion into an ideographic character acquired from the conversion program.
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