Assuming a simple model of extremely high energy collosions we investigate the relation between the one-dimensional development of extensive air showers (EAS) and the mechanism of multiple meson production. The gross structure of EAS based on the model is given graphically or numerically, in a form useful, as a first step, for further investigations. In particular, varying the value of inelasticity of high energy collisions its effect on various quantities. As a preliminary conclusion it is shown that it seems difficult to explain the experimental result of the constancy of the attenuation length of the electron component over a wide range of primary energies, 1014 ∼ 1017 eV, without introducing any energy dependence of the inelasticity or a stronger energy dependence of multiplicity with increasing energy, though it is desirable that further experiments furnish us with more abundant and reliable data. Attention will also be paid to the problem of what quantities must be measured to determine more directly and less ambiguously the angular and energy distributios of secondary particles produced by high energy collisions.