1. A control apparatus for controlling an imaging device, including (a) a printing section for performing printing on a sheet, (b) a document reading section for reading a sheet, (c) a display section for displaying information, and (d) an operation section for accepting a user's operation, and allowing a user to use (i) a first input mode in which setting information serving as information to be acquired from a user is acquired by the display section's displaying a setting window for setting the setting information and by the operation section's accepting, from the user, an operation of designating the setting information and (ii) a second input mode in which the setting information is acquired by the printing section's printing an entry sheet and the document reading section's reading the entry sheet on which the user has written the setting information, the control apparatus comprising: selecting means for selecting either the first input mode or the second input mode when the imaging apparatus acquires the setting information from the user; and instructing means for instructing the imaging apparatus to acquire the setting information in the input mode selected by the selecting means.