1. A translation apparatus, comprising: a speech input unit that receives a speech of a first language from a user; a control unit that generates sentences to be translated of the first language from the speech of the first language input from the speech input unit; a communication unit that transmits the sentences to be translated of the first language to a translation server and receives the sentences to be translated of a second language from the translation server; a display unit that displays the translated sentences of the second language along with previously translated sentences; a memory that stores a translation history including the sentences to be translated of the first language and the translated sentences of the second language; and a user input unit that receives an operation input of the previously translated sentences from a user.