A printing apparatus includes a connection interface which connects the printing apparatus to a peripheral device such as a host computer. A connection object of the connection interface is detected, and a print mode is set to a normal print mode or a demonstration print mode. In the normal print mode, printing is performed based on print data received from the host computer, depending on the detected connection object. In the demonstration print mode, printing is performed based on demonstration print data which is stored in advance. The print mode is set to the normal print mode when the connection object is the host computer and to the demonstration print mode when the connection object is not the host computer or when there is no connection object.