diff --git a/README.md b/README.md
index f4e25dd..b1f8716 100644
--- a/README.md
+++ b/README.md
@@ -9,21 +9,20 @@ $ gcloud auth application-default login
 
 ### Install Dependencies
 ```bash
-$ pip install google-cloud-speech
+$ pip install -r requirements.txt
 ```
 
-## 테스트 음성 파일 생성
-공식 *API* 페이지에는 *wav format* 이 지원된다고 명시되어 있지만 정상적으로 인식되지 않음. 
-그래서 *wav* 파일을 raw 형태로 변환하고 사용해야 함. 아래는 *mac* 에서 *wav* 를 *raw* 로 변환하는 예제.
-```bash
-$ sox hello.wav --channels=1 --rate 16k --bits 16 test.raw
-```
+# Usage
 
-## Usage
+## 음성파일 인식
+파일을 텍스트로 통째로 변환하는 방식은 아래와 같이 진행한다.
 ```bash
 $ python3 speech.py
 Transcript: 안녕 하세요 좋은 아침입니다
-$
+```
+
+다음은 파일을 `streaming` 방식으로 변환하는 방식이다.
+```bash
 $ python3 speech_streaming.py
 ====================
 transcript: 안녕 하세요 좋은 아침입니다
@@ -41,4 +40,5 @@ https://stackoverflow.com/a/33821084/4599185
 ```bash
 $ python3 transcribe_streaming_mic.py
 ```
+
 이 코드는 `googlecloudplatform` 에 등록되어있는 예제 코드를 *language* 만 변경해서 사용한 것이므로 참고하도록 한다.
diff --git a/speech.py b/speech.py
index 4ad0fae..60eacd1 100644
--- a/speech.py
+++ b/speech.py
@@ -2,13 +2,26 @@
 # -*- coding: utf-8 -*-
 import io
 import os
+import sys
+import argparse
+from opts import add_basic_args
+
+parser = argparse.ArgumentParser(description='speech to text')
+parser = add_basic_args(parser)
+args = parser.parse_args()
+
+if args.language_code not in ('ko-KR', 'en-US'):
+    raise ValueError('Unknown language-code')
+
+if not os.path.isfile(args.audio_path):
+    raise ValueError('No such file: ', args.audio_path)
 
 # Imports the Google Cloud client library
 try:
     from google.cloud import speech
 except ImportError:
-    print("Error speech import error")
-    exit(255)
+    raise ImportError('Error import speech error')
+
 from google.cloud.speech import enums
 from google.cloud.speech import types
 
@@ -18,7 +31,7 @@
 # The name of the audio file to transcribe
 file_name = os.path.join(
     os.path.dirname(__file__),
-    'test.raw')
+    args.audio_path)
 
 # Loads the audio into memory
 with io.open(file_name, 'rb') as audio_file:
@@ -28,11 +41,11 @@
 config = types.RecognitionConfig(
     encoding=enums.RecognitionConfig.AudioEncoding.LINEAR16,
     sample_rate_hertz=16000,
-    language_code='ko-KR')
+    language_code=args.language_code)
 
 # Detects speech in the audio file
 response = client.recognize(config, audio)
 alternatives = response.results[0].alternatives
 
 for alternative in alternatives:
-    print('Transcript: {}'.format(alternative.transcript))
+    print('{} : {}'.format(args.audio_path, alternative.transcript))
diff --git a/speech_streaming.py b/speech_streaming.py
index 2f0c010..7aeb8ed 100644
--- a/speech_streaming.py
+++ b/speech_streaming.py
@@ -2,24 +2,36 @@
 # -*- coding: utf-8 -*-
 import io
 import os
+import argparse
+from opts import add_basic_args
+
+parser = argparse.ArgumentParser(description='speech to text')
+parser = add_basic_args(parser)
+args = parser.parse_args()
+
+if args.language_code not in ('ko-KR', 'en-US'):
+    raise ValueError('Unknown language-code')
+
+if not os.path.isfile(args.audio_path):
+    raise ValueError('No such file: ', args.audio_path)
 
 # Imports the Google Cloud client library
 try:
     from google.cloud import speech
 except ImportError:
-    print("Error speech import error")
-    exit(255)
+    raise ImportError('Error import speech error')
+
 from google.cloud.speech import types
 
 # Instantiates a client
 client = speech.SpeechClient()
 config = types.RecognitionConfig(
     encoding='LINEAR16',
-    language_code='ko-KR',
+    language_code=args.language_code,
     sample_rate_hertz=16000)
 
 # Loads the audio into memory
-with io.open("./test.raw", 'rb') as stream:
+with io.open(args.audio_path, 'rb') as stream:
     requests = [types.StreamingRecognizeRequest(
         audio_content=stream.read(),
     )]
diff --git a/transcribe_streaming_mic.py b/transcribe_streaming_mic.py
index 9d5528a..33d9d41 100644
--- a/transcribe_streaming_mic.py
+++ b/transcribe_streaming_mic.py
@@ -36,12 +36,19 @@
 from google.cloud.speech import types
 import pyaudio
 from six.moves import queue
+import argparse
 # [END import_libraries]
 
 # Audio recording parameters
 RATE = 16000
 CHUNK = int(RATE / 10)  # 100ms
 
+parser = argparse.ArgumentParser(description='speech to text')
+parser.add_argument('--language-code', default='ko-KR', help='Language code. ( ko-KR, en-US, etc.. )')
+args = parser.parse_args()
+
+if args.language_code not in ('ko-KR', 'en-US'):
+    raise ValueError('Unknown language-code')
 
 class MicrophoneStream(object):
     """Opens a recording stream as a generator yielding the audio chunks."""
@@ -165,7 +172,7 @@ def listen_print_loop(responses):
 def main():
     # See http://g.co/cloud/speech/docs/languages
     # for a list of supported languages.
-    language_code = 'ko-KR'  # a BCP-47 language tag
+    language_code = args.language_code  # a BCP-47 language tag
 
     client = speech.SpeechClient()
     config = types.RecognitionConfig(