Disclosed is a system for recognizing a language letter inputted in a pen drag direction without switching a language mode in a terminal equipped with a touch screen having a plurality of letter input areas displayed thereon. The letter input areas have first language consonant letters that are divided into a plurality of pairs of basic and extended consonant letters. The basic and extended consonant letters of the first language are correspondingly mapped and assigned to a second language. A consonant letters-assigned to a letter input area corresponding to a touch pen input and type is selected and displayed when the touch pen input is present on the letter input areas. When the touch pen input is a pen drag in a vowel letter direction and is present on the letter input areas previously assigned vowel letter of the first language is displayed according to the vowel letter direction.