Method and apparatus for encoding/decoding image information

A deblocking filtering method, the method comprising:

• deriving a boundary of a deblocking filtering unit block which is a unit block for which deblocking filtering is performed in a reconstructed current picture;
• setting a boundary strength (bS) of a boundary of a bS setting unit block in the reconstructed current picture;
• and
• applying deblocking filtering on the boundary of the deblocking filtering unit block based on the bS by a deblocking filtering unit block,
• wherein the step of setting the bS includes setting bS for a target boundary which is a overlapped boundary of the bS setting unit block and the deblocking filtering unit block.