An image forming device includes a document information acquirer that acquires information related to a document, a sheet information acquirer that acquires information related to a print sheet, a storage that stores, in advance, information related to the document and the print sheet, and prediction condition information including proposal processing associated with the document and the print sheet, a processing predictor that acquires, based on the information related to the document and the information related to the print sheet acquired by using the prediction condition information, proposal processing associated with the placed document and the print sheet, and a proposal processing generator that generates information related to the proposal processing to be presented to a user based on the acquired proposal processing. When the user places a document and a print sheet, the proposal processing is acquired and presented to the user.