17. A system for outputting a text to a voice, comprising: a communication network; a transmitting terminal of a sender configured to transmit first text data to a receiving terminal via the communication network; and a receiving terminal configured to: convert text content of the first text data to speech using text-to-speech technologies that depends on a voice database included in a voice server, 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, and output the converted speech in voice characteristics of the sender, wherein the voice server updates 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, wherein the second voice data is transmitted and received during a voice call between the transmitting terminal and the receiving terminal, wherein the voice server quantitates a construction degree of the voice database constructed through the voice call between the transmitting terminal and the receiving terminal, and wherein the voice server quantitates 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 of 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.
25. The system according to claim 17 , wherein the voice server quantitates the 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 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, and summing up the weighted number of sentences, the weighted number of words, and the weighted number of syllables.