Function information related to a plurality of kinds of functions arranged in a first image forming apparatus is acquired. According to the approach, a customer provides item selection criteria’s to a provider and the provider sorts and displays the item information to the customer over a medium such as the Internet. The operations include determining that it is a switching timing when a predetermined condition is satisfied, and switching a currently displayed screen to a next screen and displaying the next screen on the touch panel, based on screen group information stored in the screen group storage portion, in response to determining that it is the switching timing. The discharge port is provided to the fan.