6. The apparatus according to claim 1 , further comprising: a rule storing unit that stores therein a rule of a correspondence relation between the first language and the second language; and a rule-based translating unit that translates the first recognition result into the second-language speech based on the rule, when the calculated similarity exceeds the predetermined threshold.
6. The apparatus according to claim 1 , further comprising: a rule storing unit that stores therein a rule of a correspondence relation between the first language and the second language; and a rule-based translating unit that translates the first recognition result into the second-language speech based on the rule, when the calculated similarity exceeds the predetermined threshold. 8. The apparatus according to claim 6 , wherein the rule is a conversion rule regarding a vocabulary between the first language and the second language, and the rule-based translating unit translates the first recognition result into the second-language speech based on the conversion rule.