U2 vocalist Bono has received an honorary doctorate from Tokyo's prestigious Keio University in recognition of his anti-poverty campaigning efforts.

"We believe in taking people out of extreme poverty, and Japan is more successful (in this regard) than any other country," said Bono, who was in Japan to attend the fourth Tokyo International Conference on African Development.

During the May 27 presentation, Bono also said Japan should do more to support African development efforts.