There is described an image forming apparatus, which makes it possible to securely prevent the secret information from leaking out to unauthorized personnel. The apparatus includes: a display section to display a first document that includes secret information; an operating section to designate a concealing position in the first document and establish a disclosable range of the secret information, therefrom; a storage control section to store document data, designation positional information and disclosable range information, while correlating them with each other; an authenticating section to determine whether or not a user coincides with the disclosable range, based on identification information of the user; and a printing section to print either at least a copy of the first document, when the user coincides with the disclosable range, or copies of a second document, when the authenticating section determines that the user does not coincide with the disclosable range.