  We demonstrate that the four high-frequency QPOs observed in GRS 1915+105 can
be interpreted as the oscillation modes on disks which non-linearly and
resonantly interact with a warp. The warp is assumed to be a low-frequency
global pattern on the disk. This identification suggests that the relevant
mass, $M$, and spin, $a$, of GRS 1915+105 are, $M=13\sim 14 M_\odot$ and
$a=0\sim 0.15$
