  We gave a classification of P and Q with a finite number of K-orbits of a
double flag variety G/P*K/Q for a symmetric pair (G, K) when G=GL_{m+n} and
K=GL_{m}*GL_{n}, and a description of K-orbits when the number of K-orbits of
G/P*K/Q is finite. We solved the problem by providing a correspondence between
the K-orbits and the quiver representations.
