18. The non-transitory computer readable medium according to claim 15 , wherein the program, when executed by the processor, further causes the computer to perform the following steps of the word recognition method: comparing the first word candidate and the second word candidate character by character, detecting as a matched character string a partially matched character string, and determining the unmatched characters between the first word candidate and the second word candidate by using the detected matched character string.
19. The non-transitory computer readable medium according to claim 18 , wherein the program, when executed by the processor, further causes the computer to perform the following steps of the word recognition method: extracting a first unmatched character string, which is a character string obtained by excluding the matched character string from the first word candidate, extracting a second unmatched character string, which is a character string obtained by excluding the matched character string from the second word candidate, and verifying a likelihood of the first word candidate based on a comparison of the word image to the first unmatched character string and a comparison of the word image to the second unmatched character string.