Following a trip to neighbouring Burundi, Ban travelled about 80 kilometres northeast of Goma, the capital of North Kivu province to the Mungote camp, an AFP photographer reported.
The camp located in Kitchanga, a town of 80,000 inhabitants, is home to around 15,000 people, according to the United Nations.
The UN secretary-general met with some of the women in the camp and visited a school where he shared a hot lunch with children.
The east of the vast central African nation has been plagued with armed conflicts between rival militias over ethnic and land disputes for more than 20 years.
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But the future of camps for those displaced appears in jeopardy after regional authorities in January dismantled a camp at Mokoto where 4,260 people lived, the UN said.
According to OCHA, the move it described as a "mass punishment" was sparked by the discovery of a weapon in a hut and the authorities gave "the humanitarian workers only a week to inform the population."
Ban travelled later to the capital Kinshasa where he will open tomorrow a private investment conference for the Great Lakes region aimed at attracting investors to help establish peace in a region that has been in crisis for 20 years.