1. An image processing apparatus comprising: an acquiring unit configured to acquire a page image; an extracting unit configured to extract area information from the page image acquired by the acquiring unit, the area information including information on existence or absence of a text area and a picture area; a calculating unit configured to divide the page image into a plurality of blocks and calculate an image feature value of each of the divided blocks; and a determining unit configured to determine, on the basis of the area information extracted by the extracting unit and the image feature value of each of the divided blocks calculated by the calculating unit, whether the page image includes a picture area, wherein, when the determining unit determines that the page image does not include a picture area on the basis of the area information extracted by the extracting unit, the determining unit extracts a block not overlapping a text area on the basis of the area information extracted by the extracting unit, and determines whether the page image includes a picture area on the basis of the image feature value of the extracted block.