A document reading unit performs a first reading mode for generating image data by reading a document fed by ADF and a second reading mode for generating image data by reading a document set on platen. A first reading receiver receives a first reading instruction to cause the document reading unit to continue reading a plurality of documents in the first reading mode when a jam is detected. A second reading receiver receives a second reading instruction to continue reading the plurality of documents in the second reading mode after the reading of the plurality of documents is continued in the first reading mode by the document reading unit. The document reading unit continues reading the plurality of documents in the first reading mode when the first reading instruction is received and continues reading the plurality of documents in the second reading mode when the second reading instruction is received.