A technique in the present disclosure makes it possible to accurately obtain a value selected by a user with respect to a selection-type item for which a legend is prepared in a situation where a value entered in a document is extracted from a scanned image of the document. An item name is extracted from a document image, input information input by a user is extracted from the document image, and a legend is extracted from the document image. Additionally, in a case where the input information is unsuitable as a value corresponding to the item name, the value corresponding to the item name is obtained based on the legend and the input information.