1. A communication support apparatus comprising: a speech recognizer that recognizes a first speech of a source language as a first source language sentence, and recognizes a second speech of the source language following the first speech as a second source language sentence; a determining unit that determines whether the second source language sentence is similar to the first source language sentence; and a language converter that translates the first source language sentence into a first translation sentence, and translates the second source language sentence into a second translation sentence different from the first translation sentence when the determining unit determines that the second language sentence is similar to the first language sentence.