1. A method of supporting verification of software internationalization, the method comprising: acquiring first text data output by an operating software in a first language environment; extracting, from the first text data, multiple character strings of a predetermined kind described in a language-dependent format; acquiring second text data output by the operating software in a second language environment; extracting, from the second text data, multiple character strings of the predetermined kind; associating each of the multiple character strings extracted from the first text data with each of the multiple character strings extracted from the second text data based on a difference between each character string extracted from the first text data and each character string extracted from the second text data; and comparing a first normalized character string, obtained by normalizing, in a specific description format, a first character string of the multiple character strings extracted from the first text data, with a second normalized character string, obtained by normalizing, in the specific description format, a second character string selected as being associated with the first character string from among the multiple character strings extracted from the second text data to determine whether a content represented by the first character string is consistent with a content represented by the second character string.