Despite continuing to sustain heavy losses in its game business, Sony Corp.'s group net profit increased fourfold to ¥140.2 billion in the six months through September compared with the same period last year, thanks to vigorous sales of digital cameras and computers.

Sony's operating profit jumped to ¥190 billion in the April-September period, up from ¥6.2 billion the year before, because last year the electronics company booked a ¥51.2 billion charge to cover the cost of replacing faulty lithium-ion batteries.

The approximately ¥60.7 billion it raked in from selling property related to its former head office in Tokyo's Shinagawa Ward also helped boost profits.