The man began to broadcast images of himself on live streaming service Ustream on Sunday night, announcing his plan to kill himself and discussing his views about life.
After a break, his broadcast resumed early on Tuesday and he hanged himself in his apartment about 5.30am (0730 AEDT), Sankei said.
His broadcast received many messages, with some web users encouraging him to kill himself quickly, while others urged him to desist.
Ustream stopped the broadcast after 6.00am on Tuesday, following reports from an increasing number of viewers, Yomiuri said.
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