An operating method of a host terminal that provides a service for performing a real time broadcasting through a broadcasting channel, the operating method comprising: performing the real time broadcasting for guest terminals (200, 300) of a plurality of guests who have entered the broadcasting channel; recognizing a voice of a certain user of the host terminal; recognizing (S230-S260) voice characteristics of the certain user from the voice of the certain user when the voice of the certain user is recognized for more than a standard period of time; receiving a first item and a first text, from a first guest terminal (200, 300) of a first guest among the plurality of guests; generating a first voice message converted from the first text into the voice of the certain user based on the voice characteristics of the certain user; and outputting the first voice message through a communication interface of the host terminal; wherein the recognizing the voice characteristics of the certain user comprises: extracting the voice characteristics from the voice of the certain user; generating a comparison voice based on the extracted voice characteristics; comparing the voice of the certain user and the comparison voice, wherein the comparing the voice of the certain user and the comparison voice comprises calculating an error of sampling values between the voice of the certain user and the comparison voice; and storing the voice characteristics depending on a result of the comparison, wherein storing the voice characteristics depending on the result of the comparison comprises storing the voice characteristics in response to the error of the sampling values being not more than a standard value used to determine whether the comparison voice is similar to the voice of the certain user. performing the real time broadcasting for guest terminals (200, 300) of a plurality of guests who have entered the broadcasting channel; recognizing a voice of a certain user of the host terminal; recognizing (S230-S260) voice characteristics of the certain user from the voice of the certain user when the voice of the certain user is recognized for more than a standard period of time; receiving a first item and a first text, from a first guest terminal (200, 300) of a first guest among the plurality of guests; generating a first voice message converted from the first text into the voice of the certain user based on the voice characteristics of the certain user; and outputting the first voice message through a communication interface of the host terminal; wherein the recognizing the voice characteristics of the certain user comprises: extracting the voice characteristics from the voice of the certain user; generating a comparison voice based on the extracted voice characteristics; comparing the voice of the certain user and the comparison voice, wherein the comparing the voice of the certain user and the comparison voice comprises calculating an error of sampling values between the voice of the certain user and the comparison voice; and storing the voice characteristics depending on a result of the comparison, wherein storing the voice characteristics depending on the result of the comparison comprises storing the voice characteristics in response to the error of the sampling values being not more than a standard value used to determine whether the comparison voice is similar to the voice of the certain user. extracting the voice characteristics from the voice of the certain user; generating a comparison voice based on the extracted voice characteristics; comparing the voice of the certain user and the comparison voice, wherein the comparing the voice of the certain user and the comparison voice comprises calculating an error of sampling values between the voice of the certain user and the comparison voice; and storing the voice characteristics depending on a result of the comparison, wherein storing the voice characteristics depending on the result of the comparison comprises storing the voice characteristics in response to the error of the sampling values being not more than a standard value used to determine whether the comparison voice is similar to the voice of the certain user.