1. A support device for supporting generation of text from speech data, comprising: a confirmed rate calculator for calculating a confirmed utterance rate which is an utterance rate of a confirmed part having already-confirmed text in the speech data; a candidate obtaining unit for obtaining a plurality of candidate character strings resulting from a speech recognition on an unconfirmed part having unconfirmed text in the speech data; and a selector for selecting one of the plurality of candidate character strings having an utterance time closest to an utterance time of the unconfirmed part in the speech data according to the utterance time consumed to utter the candidate character string at the confirmed utterance rate.