An image processing apparatus includes a window setting unit for setting a window including a target pixel and pixels surrounding the target pixel of input low-resolution information, a detection unit for detecting MAX and MIN values from among the pixels within the window, a quantization unit for quantizing information relating to each pixel having n values within the window into a value smaller than n, an LUT (look-up table) for determining a distribution ratio of the MAX and MIN values based on quantized values provided by the quantization unit within the window, a transformation unit for synthesizing the MAX and MIN values based on the distribution ratio, and a forming unit for forming high-resolution information from synthesized values. It is thereby possible to obtain excellent pixture quality having a high degree of freedom in the disign of an image at a speed higher than ever when converting input low-resolution information into high-resolution information.