Internal gravity waves (IGW) are separated by k-ω filtering of time-spatial temperature variations in the solar photosphere layers; the temperature variations are reproduced by solving the nonequilibrium inverse radiation transfer problem using neutral iron line profiles with a high spatial and time resolution. IGW exist in all the photosphere layers, but they are suppressed in the thin transition layer to the overshooting convection region. The power for middle photosphere sources is less by the order of magnitude than for the sources below the top of the convective zone. We revealed two types of gravity waves: 1) the waves without horizontal propagation are standing waves trapped by the convective structure; 2) running waves with moderate amplitude. Turbulent flows with high horizontal gradients of convective motions strengthen oscillations, and intensive gravity waves are excited in such layers.