When data such as a mail is received, a key input state such as a key operation frequency with respect to an active application is detected, and whether display of an application screen is to be prioritized or display of a receipt notification is to be prioritized is determined according to the time interval of key inputs. When prioritized display of the application screen is determined, the receipt notification is displayed so that it does not affect the application screen. Meanwhile, if prioritized display of the receipt notification is determined, the receipt notification is displayed and controlled so that it is on the front of the application screen.