Abstract
The time of the big bang (the birth of the universe) has been considered in this report in terms of infor-mation structure theory. Information structure theory shows that all structures in the universe were created by information; the universe has developed through cycles of energy, information and matter. The universe itself was created by information. At least three conditions are necessary to create the universe: the existence of principle(s), fluctuation, and time-space. The authors consider the uncertainty principle of time and energy, Δt・ΔE>ℏ/2, where &ℏ is Plank's constant. If the total energy of the universe, 10^<79> erg, was created by the fluctuation, ΔE, then the time of the big bang is obtained as Δt>5.27 ×10^<-107>sec. This means there was a break down of equilibrium of vacuum space. The non-equilibrium of space must have information and entropy. So, information is the origin of the structure called the universe.
