16. The portable computer of claim 10 , wherein the control unit inputs one of the first input key values and the second input key values which are assigned to one of the input keys to the system unit according to the one of the first language and the second language when one of the input keys is selected.
10. A portable computer, comprising: a keypad unit having a plurality of input keys; a system unit to operate an operating system (OS) according to one of a first language and a second language; and a control unit to generate one of a first array of first input key values and a second array of second input key values to be assigned to corresponding ones of the input keys of the keypad unit according to the one of the first language and the second language, wherein the control unit replaces a portion of the one of the first array and the second array with a portion of the other one of the first array and the second array according to the one of the first language and the second language while maintaining a remainder of the one of the first array and the second array, wherein at least one input key value of the of the first input key values is assigned a non-alphanumeric function corresponding to the first language, and the non-alphanumeric function of the first input key is changed to a character corresponding to the second language.