IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND STORAGE MEDIUM

In an image forming apparatus, a first document manager stores image data in an image storage device, associates the image data with a first identifier, outputs the image data via an image output device when the first identifier is specified via an operation device, and deletes the image data from the image storage device when a first condition is satisfied. A second document manager associates the image data with a second identifier, outputs the second identifier via the image output device, and outputs the image data via the image output device when the second identifier is input via an image input device. The first document manager does not delete the image data from the image storage device and prohibits the operation device from specifying the first identifier when the image data is associated with both the first and second identifiers.