1. A television signal processing circuit which performs a decoding processing sequentially in micro block units for a HDTV signal with a high resolution and a SDTV signal with a low resolution, comprising: an inverse quantization section which performs inverse quantization processing with respect to data which is coded; a decoding section which performs decoding processing for data which is inversely quantized; a motion compensation section which performs motion compensation processing on data which is decoded; a determination circuit configured to output a control signal for controlling read/write processing of a buffer memory, wherein the control signal indicates whether the television signal is the HDTV signal or the SDTV signal; a control circuit configured to receive the control signal and manage read/write processing of the buffer memory based on the control signal, wherein, for the control signal indicating the HDTV signal, read/write processing is performed with two banks, and wherein, for the control signal indicating the SDTV signal, read/write processing is performed with a single bank, wherein when processing the HDTV signal, data reduction processing is performed in the inverse quantization section and subsequent processing is performed on reduced data, and pipeline processing, in which processing in different stages is performed in parallel, is executed for two micro blocks, wherein when processing the SDTV signal, processing in each stage is sequentially executed without performing the data reduction processing and the pipeline processing, wherein the buffer memory is provided between adjacent processing sections in respective stages, and data processed in a processing section in a previous stage is supplied via the buffer memory to a processing section in a following stage, wherein when processing the HDTV signal, processed data is sequentially written into the two banks, while processed data is read from a bank into which data writing is not being performed and supplied to the processing section in the following stage, and when processing the SDTV signal, processed data is sequentially written into the single bank, while processed data which is written is read and supplied to the processing section in the following stage.