A decoding apparatus is disclosed which includes: a decoding information acquisition block acquiring decoding information necessary for decoding in units of a macro block from coded data; a decoding block decoding the coded data into decoded data based on the decoding information; a quantization noise filter block performing a noise reduction process on the decoded data for reducing a predetermined quantization noise per macro block; a quantization noise occurrence indicator generation block generating, based on the decoding information, a noise occurrence indicator indicative of the predetermined quantization noise in a manner reflecting a coded state of each of the blocks constituting the macro block; and a parameter setting block setting parameters for the quantization noise filter block based on the noise occurrence indicator.