Kabila vows to rebuild Congo in new term

* Kabila congratulates Congolese voters

* Mugabe, Western ambassadors attend ceremony

* Amnesty International calls for halt to opposition arrests

By Jonny Hogg

KINSHASA, Dec 20 (Reuters) - Joseph Kabila was sworn in on Tuesday for a new term as president of Democratic Republic of Congo, promising to improve the business climate and rebuild infrastructure destroyed during decades of conflict.

Kabila, in power in the central African state since his father's assassination in 2001, was reelected in a Nov. 28 poll meant to shore up stability, but which was marred by deadly violence and allegations of fraud.

"We are going to pursue an improvement of the business climate to better serve investors. We are also going to pursue and accelerate the reconstruction of the country," Kabila said after he was sworn in by the Supreme Court.

He said reconstruction would focus on communication infrastructure in the vast country, which is over half the size of the European Union, but would also include projects such as building hospitals and schools.

Congo is the sixth worst place to do business out of 183 countries ranked by the World Bank, despite its vast minerals resources, and the average person lives on just over 50 cents a day.