1. A method of outputting a text to a voice through a communication network, the method of outputting a text to a voice comprising: transmitting, by a transmitting terminal of a sender, first text data to a receiving terminal via said communications network; converting, by the receiving terminal, text content of the first text data transmitted from the transmitting terminal to speech using text-to-speech technologies that depends on a voice database, wherein the voice database comprises the first text data and first voice data of the sender, and the first text data corresponds to the first voice data; outputting the converted speech in voice characteristics of the sender, updating the voice database by storing second voice data of the sender and second text data corresponding to the second voice data in the voice database, the second voice data is transmitted and received during a voice call between the transmitting terminal and the receiving terminal, and quantitating a construction degree of the voice database constructed through the voice call between the transmitting terminal and the receiving terminal, wherein the quantitating comprises quantitating the construction degree of the voice database for each text data sender by summing up a number of sentences, a number of words, and a number of syllables in the first and second voice data and the first and second text data stored in the voice database for each sentence, each word, and each syllable.
14. The method according to claim 1 , before the outputting the converted speech in the voice characteristics of the sender, further comprising: conducting a search to determine whether the sender's first voice data is present in the voice database; extracting, from the voice database, voice data corresponding to the first text data transmitted from the transmitting terminal based on a search result in the conducting the search; and transmitting the voice data extracted to the receiving terminal.