1. A method comprising: receiving, using a processor, a plurality of respective candidate target texts which are generated by translation of a source text in the first language into a target text in the second language different from the first language as candidates for the target text in the second language; specifying, using the processor, combinations of phrase pairs used to generate the respective candidate target texts among phrase pairs contained in a phrase table, the phrase table stored in a server and containing the phrase pairs each being a pair of a phrase in the first language and a phrase in the second language; and recording, using the processor, combination information in the server, the combination information identifying the combinations of phrase pairs.