APPARATUS FOR ENCODING AND DECODING KEY DATA AND KEY VALUE DATA OF COORDINATE INTERPOLATOR AND RECORDING MEDIUM CONTAINING BITSTREAM INTO WHICH COORDINATE INTERPOLATOR IS ENCODED

An apparatus for encoding and decoding key data and key value data of a coordinate interpolator and a recording medium, on which a bitstream, into which a coordinate interpolator is encoded, is written, are provided. The bitstream includes key data encoding/decoding information, into which key data and information necessary to decode the key data are encoded, and key value data encoding/decoding information, into which key value data and information necessary to decode the key value data are encoded. The key data encoding/decoding information includes inverse DND operation information including the order of inverse DND indicating a predetermined number of cycles of inverse DND to be performed on differential data generated by entropy-decoding the bitstream in order to extend the range of the differential data.