FIG. 5 is a diagram illustrating a flowchart in the present embodiment. The flowchart illustrated in FIG. 5 is processing to be executed after the power supply of the multifunction inkjet printer 1 is turned on. The series of processes illustrated in the flowchart of FIG. 5 is performed by the CPU 101 retrieving a program code stored in the ROM 102 into the RAM 103 and executing the program code. Alternatively, a part or all of the functions in the steps of FIG. 5 may be implemented by hardware such as an ASIC or an electronic circuit. The symbol “S” in the explanation of each process means that it is a step of the flowchart.

In S501, the CPU 101 determines whether a request to display a two-dimensional code has been provided, and the CPU 101 stands by until a request to display a two-dimensional code is provided. Whether a request to display a two-dimensional code has been provided is determined by determining whether or not the “DISPLAY TWO-DIMENSIONAL CODE” button has been selected by the user by operating the key group 21 as illustrated in FIG. 3A, for example. At the timing of S501, that is, in a case where such a menu screen as illustrated in FIG. 3A is displayed on the display device 20, the display on the display device 20 is being performed in the normal mode. That is, the display is performed at the first refresh rate R1.