To enable a user to recognize, at a glance, an input object with which data input for execution of processing is expected.

A set screen A4 displayed on a liquid crystal display screen 2 is provided with input columns 32 for inputting of data and set buttons 33. Guide display parts 34 are set in the respective positions made correspondent to these input columns 32 and the set buttons 33. In the case of a data non-input state, the guide display part 34 of this item flickers at a high speed. In the case of the state already inputted with the previously used data, the guide display part 34 of this item flickers at a low speed. When the data is updated, the flickering of the guide display parts 34 is stopped. On the other hand, a start button 37 for executing the processing flickers at a high speed if the necessary data is made evenly uniform by the previously used data. This button flickers at a low speed when the necessary data is made uniform by updating.