<PAGE>
POWER OF ATTORNEY
-----------------
KNOW ALL MEN BY THESE PRESENTS that each of the undersigned, a director
and/or officer of NIPPON TELEGRAPH AND TELEPHONE CORPORATION, a Japanese
corporation (the "Company"), hereby constitutes and appoints Mr. Satoru Miyamura
each of the undersigned's true and lawful attorney and agent, with full power of
substitution and resubstitution, to do any and all acts and things and to
execute any and all instruments which said attorney and agent may deem necessary
or desirable to enable the Company to comply with the Securities Act of 1933, as
amended, and any rules, regulations and requirements of the Securities and
Exchange Commission thereunder in connection with the registration under such
Act of Common Stock of the Company in the form of shares or American Depositary
Shares, to be offered on terms to be determined at the time such securities are
offered for sale, including specifically, but without limiting the generality of
the foregoing power and authority:
1. To sign the name of the Company and the name of the undersigned,
individually and in his capacity as director or officer of the Company, to a
Registration Statement on Form F-3 relating to the shares of Common Stock and
any Registration Statement on Form F-6 relating to American Depositary Receipts
representing such shares to be filed with the Securities and Exchange Commission
with respect to said securities, to any and all amendments, including post-
effective amendments to such Registration Statement, and to any and all
instruments or documents filed as a part of or in connection with such
Registration Statement and amendments; and
2. To sign such other documents and do such other things as said
agent and attorney-in-fact may deem necessary or appropriate in connection with
the foregoing.
Each of the undersigned hereby ratifies and confirms all that said attorney
and agent shall do or cause to be done by virtue hereof.
IN WITNESS WHEREOF each of the undersigned has subscribed these presents
this 29th day of September, 2000.
/s/ Jun-ichiro Miyazu /s/ Norio Wada
--------------------- --------------
Jun-ichiro Miyazu Norio Wada
President Senior Executive Vice President
(Principal Executive Officer) (Director)
(Director)
/s/ Yusuke Tachibana /s/ Haruki Matsuno
-------------------- ------------------
Yusuke Tachibana Haruki Matsuno
Senior Executive Vice President Senior Executive Vice President
(Director) (Director)
-1-
<PAGE>
/s/ Kanji Koide /s/ Shigehiko Suzuki
--------------------------- ----------------------------
Kanji Koide Shigehiko Suzuki
Senior Vice President Senior Vice President
(Director) (Director)
/s/ Hiromi Wasai /s/ Toyohiko Takabe
---------------- ----------------------
Hiromi Wasai Toyohiko Takabe
Senior Vice President Senior Vice President
(Director) (Director)
/s/ Satoru Miyamura /s/ Takashi Imai
------------------- ----------------
Satoru Miyamura Takashi Imai
Senior Vice President Senior Vice President
(Principal Financial and Accounting Officer) (Director)
(Director)
/s/ Yotaro Kobayashi
--------------------
Yotaro Kobayashi
Senior Vice President
(Director)
-2-
<PAGE>
POWER OF ATTORNEY
-----------------
KNOW ALL MEN BY THESE PRESENTS that the undersigned, as Executive Vice
President of NTT AMERICA, INC., a Delaware corporation (the "Company"), hereby
constitutes and appoints Mr. Satoru Miyamura the undersigned's true and lawful
attorney and agent, with full power of substitution and resubstitution, to do
any and all acts and things and to execute any and all instruments which said
attorney and agent may deem necessary or desirable to enable the Company to
comply with the Securities Act of 1933, as amended, and any rules, regulations
and requirements of the Securities and Exchange Commission thereunder in
connection with the registration under such Act of Common Stock of the Company
in the form of shares or American Depositary Shares, to be offered on terms to
be determined at the time such securities are offered for sale, including
specifically, but without limiting the generality of the foregoing power and
authority:
1. To sign the name of the Company and the name of the
undersigned, individually and in his capacity as officer of the Company, to a
Registration Statement on Form F-3 relating to the shares of Common Stock and
any Registration Statement on Form F-6 relating to American Depositary Receipts
representing such shares to be filed with the Securities and Exchange Commission
with respect to said securities, to any and all amendments, including post-
effective amendments to such Registration Statement, and to any and all
instruments or documents filed as a part of or in connection with such
Registration Statement and amendments; and
2. To sign such other documents and do such other things as said
agent and attorney-in-fact may deem necessary or appropriate in connection with
the foregoing.
The undersigned hereby ratifies and confirms all that said attorney and
agent shall do or cause to be done by virtue hereof.
IN WITNESS WHEREOF the undersigned has subscribed these presents this 29th
day of September, 2000.
/s/ Akihiko Okada
-----------------
Akihiko Okada
Executive Vice President
