[en] Kinetic theory of high-n electromagnetic low frequency modes in a finite-beta toroidal plasma is investigated in a collisionless limit. The high-n electromagnetic ballooning mode is identified and compared with the MHD ballooning mode. This mode is found to be always unstable with the growth rate of the order of the drift frequency. As beta-value increases and approaches the critical beta-value predicted by the MHD theory, the growth rate becomes large and the real frequency downshift appears. Toroidal shift of the magnetic axis and the magnetic well have the stabilization effects, but the mode is unstable even in the ''second stability region'' of the MHD theory. The growth rate normalized to the drift frequency has a peak in the MHD-unstable parameter region, but the peak is low. In the zero-beta limit, this mode turns out to be the electrostatic ballooning mode. The drift and drift-Alfven branches are also identified in toroidal plasmas but remain to be stable due to the magnetic shear. (author)