A method of outputting a text to a voice through a communication terminal, the method of outputting a text to a voice comprising: transmitting, by a transmitting terminal, text data to a receiving terminal; and outputting, by the receiving terminal, text content of the text data transmitted from the transmitting terminal to a voice of a sender of the text data; further comprising: constructing a voice database for voice data of the sender of the text data before receiving the text data; quantitating a construction degree of the voice database constructed through the voice call between the transmitting terminal and the receiving terminal after the constructing a voice database; characterized in that it further comprises grading the construction degree of the voice database by a predetermined grade based on a value quantitated in the quantitating after the quantitating; and outputting, by the receiving terminal, the grade graded in the grading through a display, after the grading; wherein the quantitating comprises quantitating a construction degree of the voice database for each text data sender by providing each weight to a number of sentences, a number of words, and a number of syllables in the voice data and the text data stored in the voice database for each sentence, each word, and each syllable, and summing up the weighted number of sentences, the weighted number of words, and the weighted number of syllables, and the outputting the graded grade comprises outputting different visual information based on the predetermined grade. transmitting, by a transmitting terminal, text data to a receiving terminal; and outputting, by the receiving terminal, text content of the text data transmitted from the transmitting terminal to a voice of a sender of the text data; further comprising: constructing a voice database for voice data of the sender of the text data before receiving the text data; quantitating a construction degree of the voice database constructed through the voice call between the transmitting terminal and the receiving terminal after the constructing a voice database; characterized in that it further comprises grading the construction degree of the voice database by a predetermined grade based on a value quantitated in the quantitating after the quantitating; and outputting, by the receiving terminal, the grade graded in the grading through a display, after the grading; wherein the quantitating comprises quantitating a construction degree of the voice database for each text data sender by providing each weight to a number of sentences, a number of words, and a number of syllables in the voice data and the text data stored in the voice database for each sentence, each word, and each syllable, and summing up the weighted number of sentences, the weighted number of words, and the weighted number of syllables, and the outputting the graded grade comprises outputting different visual information based on the predetermined grade. constructing a voice database for voice data of the sender of the text data before receiving the text data; quantitating a construction degree of the voice database constructed through the voice call between the transmitting terminal and the receiving terminal after the constructing a voice database; characterized in that it further comprises grading the construction degree of the voice database by a predetermined grade based on a value quantitated in the quantitating after the quantitating; and outputting, by the receiving terminal, the grade graded in the grading through a display, after the grading; wherein the quantitating comprises quantitating a construction degree of the voice database for each text data sender by providing each weight to a number of sentences, a number of words, and a number of syllables in the voice data and the text data stored in the voice database for each sentence, each word, and each syllable, and summing up the weighted number of sentences, the weighted number of words, and the weighted number of syllables, and the outputting the graded grade comprises outputting different visual information based on the predetermined grade.