An image processing apparatus includes an image-area separator that separates a character area from monochrome document data scanned by a scanner, a character pixel detecting unit that counts the number of pixels of a character in the main scanning direction and the sub-scanning direction included in a controller, a bolded character identifying unit that identifies a character as a bolded character in case the count result is larger than a predefined threshold value, and a color converter that converts the bolded character into color data.