Abstract: The portable player is connected to a first connector, and the PC is connected to a second connector. A first connection detecting unit detects whether the portable player is connected, and a second connection detecting unit detects whether the PC is connected. A central processing unit (CPU) switches to a reproduction mode in which an audio signal based on audio data reproduced by the portable player is supplied by the audio processing unit to the speaker, or a PC communication mode in which the portable player and the PC are connected to be in a state in which they can communicate with each other.

Abstract: The portable player is connected to a first connector, and the PC is connected to a second connector. A first connection detecting unit detects whether the portable player is connected, and a second connection detecting unit detects whether the PC is connected. A central processing unit (CPU) switches to a reproduction mode in which an audio signal based on audio data reproduced by the portable player is supplied by the audio processing unit to the speaker, or a PC communication mode in which the portable player and the PC are connected to be in a state in which they can communicate with each other.

Abstract: A communication terminal apparatus includes a telephone circuit for generating a detection signal in response to a received calling signal in an automatic receiving mode, and a control unit for transmitting an answer-back tone signal in response to the detection signal from the telephone circuit. After transmitting the answer-back tone signal, in response to externally supplied DTMF signals representing a data input start signal, key-in data, and a data input end signal, the control unit sequentially stores the key-in data in a memory and drives a printer on the basis of the key-in data stored in the memory.