1. A method for improving reading accuracy in speech recognition using processing by a computer, the method comprising computer-executed steps of: program instructions to obtain a plurality of candidate word strings from speech recognition results, wherein the speech recognition results contain a speech recognition score for each of the plurality of candidate work strings; program instructions to determine a reading of each of the plurality of candidate word strings, wherein two or more candidate word strings have the same reading, and wherein the two or more candidate word strings having the same reading are homophones; program instructions to determine a reading score for each candidate word string, wherein the reading score for each of the two or more candidate word strings with the same reading is based on a total value of the speech recognition scores for the two or more candidate word strings with the same reading, wherein determining the total value of the speech recognition scores for the two or more candidate word strings with the same reading includes computer-executed steps of: program instructions to determine two or more candidate word strings with partial tolerable different readings allowing for a partial difference in readings between two or more candidate word strings treated as having the same reading, partial tolerable different readings being a first predetermined value, the partial difference in readings range being a predetermined range of values; and program instructions to calculate the reading score total value of the speech recognition scores for the two or more candidate word strings with the same reading wherein the speech recognition scores for the two or more candidate word strings with partial tolerable different readings are to be treated as having the same reading, wherein calculating the reading score total value of the speech recognition scores for the two or more candidate word strings with the same reading includes: program instructions to receive a conversion table, wherein the conversion table includes word strings, wherein the word strings includes word notations and phoneme strings, and wherein the conversion table contains word strings with partial tolerable different readings allowing for a partial difference in readings between two or more candidate word strings treated as having the same reading, and wherein determining the two or more candidate word strings with partial tolerable different readings allowing for a partial difference in readings between two or more candidate word strings treated as having the same reading is based on the conversion table; program instructions to receive N-best lists from a plurality of speech recognition systems, wherein the N-best lists contain the two or more candidate word strings; program instructions to determine a match of the two or more candidate word strings within the N-best list and the conversion table of; and program instructions to convert the matched of the two or more candidate word strings according to the conversion table; and program instructions to select a candidate among the plurality of candidate word strings to output on the basis of the reading score and the speech recognition score corresponding to each word string, wherein program instructions to select the candidate includes a computer system-executed step selected from the group consisting of: program instructions to weight and add together the speech recognition score and the corresponding reading score for each candidate word string to obtain a new score, and program instructions to select the candidate word string with the highest new score; and program instructions to select a candidate word string with the highest speech recognition score from among the one or more candidate word strings with the highest reading score.