To provide a document format identification apparatus capable of correctly identifying a document format even in an environment where a number of types of scanners are used. The document format identification apparatus includes: an extraction unit for extracting a feature for a document the format of which to be identified; a generation unit for generating, based on the feature extracted by the extraction unit, document format data containing identification data for identifying a document format and correction information for correcting a feature difference produced by a difference in type of the image input apparatus; and an identification unit, for correcting document format data stored in a storage unit and document format data generated by the generation unit based on the correction information and for identifying a document format of a document to be identified by comparing the corrected document format data.