A receiving device and a receiving method enabling the high-speed and high-accuracy interference reducing process are provided. The interference reduction receiving device despreading digital signal at a plurality of timings, multiplying each of the signals after being despread by a weight and combining the signals, comprises an estimation unit estimating channel response vector having, as elements, channel estimation values corresponding to the respective timings based on the digital signal, a quantizing unit quantizing the digital signal in the vicinity of the respective timings, a signal correlation matrix generation unit generating a signal correlation matrix having, as the element, each signal correlation value calculated based on the respective quantized signals, and an weight calculating unit calculating the weight based on the channel response vector and the signal correlation matrix.