A method of writing a specific time point through a familiar pattern input that can be instantaneously applied to a portion desired to be memorize or highlighted by the user during audio recording. An electronic device according to an embodiment disclosed in the present disclosure may include a storage unit configured to store audio data and the recording information of the audio data; a controller configured to convert an input audio signal into audio data to store the audio data; a display unit configured to display one or more texts based on the execution of a speech-to-text (STT) for the input audio signal; and an input unit configured to receive a specific pattern input or a selection input for part of the texts from the user while receiving the audio signal.