A character input device and its method are disclosed. In one embodiment, the device includes: i) a base, ii) an input unit positioned at the base to allow each of first direction input and second direction input to be independently performed, the first direction input being performed by moving the input unit from a reference position to any one of a plurality of first direction indication positions spaced and arranged radially from the reference position within a predetermined input area and the second direction input being performed by selecting any one of a plurality of second direction indication positions spaced and arranged radially in the input unit itself; a first sensing unit for sensing the movement of the input unit, iii) a second sensing unit for sensing the second direction input and iv) a control unit for extracting and running a first character or a second character from a memory unit, the first character being assigned to the first direction indication position in which the movement of the input unit is sensed, and the second character being assigned to the second direction indication position in which the second direction input is sensed, thereby making it possible to minimize a necessary space for inputting characters and accurately input each character according to a user's intention.