To improve the usability and the handleability by designating a processing procedure from a designating means for coping with the error in the case an error of the device is generated, lighting or flashing a light-emitting means pertaining to the portion designated by the processing procedure, and generating a warning in the case a process different from the processing procedure is executed.

When printing data designating a printing operation with, for example, a B4 size paper from a host computer to a paper-feeding drive device 110 are received by a printer 100, in the case the paper size of a paper feeding cassette mounted on the paper feeding drive device 110 is not the designated B4 size, but for example, it is an A4 size, a message 'please replace B4 papes' is displayed on a display panel 102 via a printer control part. Next, a lamp 113 is flashed, and at the same time, a message 'please take out the cassette with the lamp flashing' is displayed. Moreover, in the case the A4 cassette 103 is not taken out, a message 'the cassette taken out is not the A4 cassette' is displayed.