A system including: a control device; a storage device that stores a file; a display device; and a voice device, wherein the control device displays a list of first identification display for specifying the file on the display device when voice of a command for displaying a list is input from a user via the voice device, the control device assigns an identification code to the file displayed in the list, and displays the identification code as second identification display, and the control device selects the file corresponding to the identification code when voice including the identification code is input from the user via the voice device.