6. An apparatus for inputting an alphabet character in a terminal with a numeric keypad comprising a plurality of keys with ambiguous character entry, the apparatus comprising: a memory for storing various alphabet characters input through the keypad and respective priority tables that correspond to the various alphabet characters, and storing in each of the priority tables, an occurrence frequency of at least two alphabet characters mapped, in the priority table, to a second key input immediately succeeding a corresponding first input character; and a controller for searching for a priority table whenever the key is stroked for a first input character, receiving a second input character by sequentially traversing a plurality of alphabet characters mapped to the second key, retrieved from the priority table in a prioritized order from higher associated frequency to lower associated frequency, and determining, as the second input character, a character from among the retrieved characters mapped to the second key, wherein the priority table has at least one association of a succeeding alphabet character with a position of the succeeding alphabet character in a word based on the succeeding alphabet character's frequency of occurrence succeeding the first input character.
6. An apparatus for inputting an alphabet character in a terminal with a numeric keypad comprising a plurality of keys with ambiguous character entry, the apparatus comprising: a memory for storing various alphabet characters input through the keypad and respective priority tables that correspond to the various alphabet characters, and storing in each of the priority tables, an occurrence frequency of at least two alphabet characters mapped, in the priority table, to a second key input immediately succeeding a corresponding first input character; and a controller for searching for a priority table whenever the key is stroked for a first input character, receiving a second input character by sequentially traversing a plurality of alphabet characters mapped to the second key, retrieved from the priority table in a prioritized order from higher associated frequency to lower associated frequency, and determining, as the second input character, a character from among the retrieved characters mapped to the second key, wherein the priority table has at least one association of a succeeding alphabet character with a position of the succeeding alphabet character in a word based on the succeeding alphabet character's frequency of occurrence succeeding the first input character. 9. The apparatus of claim 6 , wherein the controller determines whether there is any key input corresponding to an end of inputting a sentence, and stores the sentence as a message, if the key input corresponds to the end of inputting the sentence.