A code sequence is encoded using a code conversion table in which the parity of the code sequence varies until the code states become equal to each other. The code word assignment used in this code conversion table is such that the decoded code word constraint length is 3 blocks and q0q1 for an arbitrary information sequence is satisfied even if a DC control bit is inserted at any of the first and second bits of an information word. For example, code states s0 and s1 when information sequences d0 and d1 resulted from insertion of provisional DC control bits 1 and 0 inserted at the top of an information sequence "1, 1, 0, 0, 0, 1, 0" are encoded starting with a state 3 according to a predetermined code conversion table are equal to each other, namely, s0=s1=6, in a third block, and two's complement q0 of a sum of code sequences c0 up to a time when the code states are equal to each other is "0" while two's complement q1 of a sum of code sequences c1 up to that time is "1". That is, the condition that q0q1 is met. The present invention can be applied to a recorder/player or encoder.

 
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