In a document data management apparatus to manage document data read and digitized by an image reading apparatus, management of the document data is performed in view of the reliability of an image reading processing of the image reading apparatus, so that the reliability of various processings using the document data is improved. There are included a document data acquisition unit to acquire document data read and digitized by an image reading apparatus, a reliability determination unit to determine reliability of an image reading processing of the image reading apparatus for the document data based on the document data acquired by the document data acquisition unit, and a storage prohibition unit to prohibit, with respect to the document data for which the reliability determined by the reliability determination unit is lower than a specified threshold value, storage of the document data.