There is provided a communication terminal apparatus that enables quick response in screen display and quick retrieval of desired melodies in a musical tone data distributing service and reduces a communication fee. A java incoming call melody program including core display data is received from a server apparatus through the Internet and is stored in a RAM. When the stored program is executed, a display screen is formed based on the core display data according to the program and is displayed on a display. A cellular phone receives the distributing service by receiving desired musical tone data from the server apparatus via the Internet using the display screen.