참고 링크
http://www.google.com/fonts/earlyaccess
1. css에 아래 코드를 넣고

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@import url(http://fonts.googleapis.com/earlyaccess/nanumgothic.css);

위에 것 대신 아래 코드로 해야 될 때가 있는데 원인을 몰랐는데요.
위에 코드로 할 때는 다른 스타일 보다 앞에 있어야 적용이 됩니다.

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/*
 * Nanum Gothic (Korean) http://www.google.com/webfonts/earlyaccess
 */
@font-face {
  font-family: 'Nanum Gothic';
  font-style: normal;
  font-weight: 700;
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Bold.eot);
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Bold.eot?#iefix) format('embedded-opentype'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Bold.woff2) format('woff2'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Bold.woff) format('woff'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Bold.ttf) format('truetype');
}
@font-face {
  font-family: 'Nanum Gothic';
  font-style: normal;
  font-weight: 400;
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Regular.eot);
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Regular.eot?#iefix) format('embedded-opentype'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Regular.woff2) format('woff2'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Regular.woff) format('woff'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-Regular.ttf) format('truetype');
}
@font-face {
  font-family: 'Nanum Gothic';
  font-style: normal;
  font-weight: 800;
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-ExtraBold.eot);
  src: url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-ExtraBold.eot?#iefix) format('embedded-opentype'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-ExtraBold.woff2) format('woff2'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-ExtraBold.woff) format('woff'),
       url(//themes.googleusercontent.com/static/fonts/earlyaccess/nanumgothic/v3/NanumGothic-ExtraBold.ttf) format('truetype');
}

2. 원하는 선택자에 스타일 적용

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font-family: 'Nanum Gothic', sans-serif;

볼드체로 하려면 아래와 같이함.

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font-family: 'Nanum Gothic', sans-serif;
font-weight:Bold;

좀더 자세히 설명해 놓은데가 있어서
[링크]