According to an aspect, a display device includes a signal processing unit that converts an input value of a input HSV color space of an input signal into an extension value of an extended HSV color space extended with a first color, a second color, a third color, and a fourth color to generate an output signal; performs peaking processing for analyzing the input signal of the imaged image to detect a focusing region; and determines whether to perform display in a peaking mode for highlighting the focusing region. When it is determined to perform display in the peaking mode, the signal processing unit increases a value of the output signal of the fourth color of a pixel in an outer edge of the focusing region.