A deblocking filtering method may includes setting first through nth macroblock groups which are adjacent to one another in a column direction and sequentially performing deblocking filtering on the first through nth macroblock groups. Each macroblock group may include at least one macroblock. An image processing device may include a deblocking filter that performs deblocking filtering in macroblock units; and a control unit that sets first through nth macroblock groups, which are adjacent to one another in a column direction, and that controls the deblocking filter to sequentially perform deblocking filtering on the first through nth macroblock groups. Once again, each macroblock group may include at least one macroblock.
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