1. A method of recognizing a speech of an electronic apparatus, the method comprising: receiving a speech of a speaker; analyzing the received speech of the speaker and extracting phonemic characteristics for recognizing the speech and voice print characteristics for registering the speaker; in response to the speech of the speaker corresponding to a pre-registered trigger word or phrase based on the extracted phonemic characteristics, changing to a speech recognition mode of the electronic apparatus and registering the extracted voice print characteristics as voice print characteristics of the speaker who spoke the speech; and in response to the extracted voice print characteristics being registered, displaying a graphic user interface (GUI) indicating whether the extracted voice print is registered.