In printing an electronic document on a paper, an MFP prints a code image created by encoding a paper ID including a local ID issued to the paper and stores paper information with the paper ID. The MFP determines a type of data format, creates a paper ID in the data format, and prints a code image created by encoding the paper ID. In copying a printed paper, the MFP decodes the code image printed on the paper to acquire the paper ID and retrieves paper information associated with the paper ID according to the data format. The MFP specifies the electronic document as a print source from retrieved paper information and performs printing using the electronic document.