The Light Korean Presbyterian Church in Mississauga, Ont., says it also wants the United Nations to step in to help the Canadian government work on the release of Rev. Hyeon (HE'-yun) Soo Lim.
The family hasn't heard from Lim since he went to North Korea on Jan. 31.
Lim, 60, has travelled to North Korea more than 100 times on humanitarian missions, according to family and church spokeswoman Lisa Pak, with much of his work concentrated in the impoverished country's northeastern region of Rason.
Pak has said Lim is facing charges, but could not say what they are.
The church says Lim has demonstrated nothing but "Christ-like compassion" for the people of North Korea.