As of 9:15 a.m., the 225-issue Nikkei Stock Average added 82.23 points, or 0.28 percent, from Monday to 29,849.20.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, rose 3.78 points, or 0.19 percent, at 1,972.51.
Information and communication, electric power and gas and electronic appliance issues comprised those that gained the most in the opening minutes after the morning bell.
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