A method, medium, and apparatus for generating a record sentence to establish a speech corpus, including generating a synthesized sentence of speech and synthesis information related to speech synthesis by performing speech synthesis for a predetermined sentence of text, selecting an unseen sentence including an unseen unit according to the synthesis information, generating a weight indicating a recording priority of the unseen unit included in the selected unseen sentence, and generating a record sentence by combining the unseen unit with the speech synthesis information according to the generated weight.
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