A government-affiliated bank is considering investing in a joint personal computer business that Fujitsu Ltd. and China's Lenovo Group Inc. are negotiating amid a shrinking domestic PC market, sources close to the matter said Saturday.

The Development Bank of Japan aims to support the joint venture between Japanese electronics maker Fujitsu's PC business, which it spun off earlier this year, and the world's biggest PC manufacturer, Lenovo.

Under consideration is a plan for Lenovo to take a 51 percent share, Fujitsu more than a one-third, and the bank the rest of the shares. But the companies may also eye more investors, the sources said.

The companies are hoping to complete the deal this month but it may take more time, the sources added.

The DBJ, which specializes in helping industries consolidate and troubled firms get back on their feet, invested in 2014 in a joint venture set up by Fujitsu and Panasonic Corp. to design and develop system LSI chips for cars and smartphones.