In a recording and reproducing apparatus, and in a time calibration method of the recording and reproducing apparatus, first and second clock units are provided for counting time. A clamping force is exerted on the two ablation members such that the tissue of the hollow organ is clamped therebetween. The PHY layer is configured to construct a physical-layer service data unit based on a concatenate block, an insert shortened bits block, a Bose, Ray-Chaudhuri, Hocquenghem encoder, a remove shortened bits block, an add pad bits block, a spreader, a bit interleaver, a scrambler, and a symbol mapper.