According to an embodiment of the present disclosure, an electronic device may include a camera module obtaining image data of a user, a controller configured to detect at least one feature corresponding to an intention of the user from the image data obtained by the camera module, to obtain a pattern based on the at least one feature, to determine text data corresponding to the pattern, and to convert at least a portion of the text data into voice data, and an output module outputting the voice data. Other various embodiments of the pattern recognition are also provided.