1. An image processing apparatus, comprising: a memory configured to store instructions; and at least one processor, upon executing the stored instructions, configured to: calculate a feature value of an input frame image by analyzing the input frame image, compare the feature value of the input frame image with a feature value of a previous frame image, identify, based on a result of the comparison, at least one area that the feature value is changed in the input frame image and calculate a degree of the change in the feature value of each area, and color-code the area based on the degree of the change in the feature value to generate a color-coded frame image, wherein the at least one processor is further configured to color-code the area by adjusting at least one of a color, a color saturation, or a transparency based on the degree of the change in the feature value to visually distinguish the color-coded area.