Abstract: A jog key of a portable terminal and an operation method thereof. The portable terminal includes a jog key for inputting a direction signal, a push signal, or a pull signal. A storage unit stores a key map for mapping a specific function to an operation signal of the jog key. And a control unit senses an input of the operation signal of the jog key and executes a function mapped to the input operation signal of the jog key. This may provide various functions using a jog key to improve convenience of a user.

Abstract: An interface device of a mobile communication terminal that enables both universal serial bus (USB) communication and charging functions using an external memory socket, and an interface method in a mobile communication terminal using the interface device are disclosed. The interface device includes: a socket module into which a card is inserted; and an interface control unit determining whether the card inserted into the socket module is an external memory card or a universal serial bus (USB) communication card connected to a USB connection line connecting the mobile communication terminal to a personal computer (PC), and performing a function corresponding to the type of the card.