1. A method, comprising: receiving original speech data; compressing the original speech data based on a phoneme stream, detected from the original speech data, and a delta stream, extracted based on the difference between a speech signal stream, generated using the phoneme stream with respect to a voice font, and the original speech data, to generate compressed speech data; sending the compressed speech data; receiving the compressed speech data; and decompressing the compressed speech data based on a decompressed phoneme stream and a decompressed delta stream to generate recovered speech data.