A Y histogram creation processing unit detects the signal level (luminance level) of the Y signal component of each pixel of a frame on the basis of YUV signals, and creates a histogram by totaling the number of pixels for each signal level. In this processing, a histogram is created by adding values weighted depending on whether a region in a predetermined range around each pixel includes a monotonous pattern. A histogram shape processing unit shapes the histogram. An input/output correction characteristic creation processing unit performs normalization by cumulative addition. A correction lookup table creation processing unit creates a lookup table on the basis of the input/output correction characteristic obtained by the input/output correction characteristic creation processing unit. A Y correction processing unit corrects a Y signal on the basis of the table.