  We reconsider the gauge hierarchy problem from the viewpoint of effective
field theories and a high-energy physics, motivated by the alternative scenario
that the standard model holds up to a high-energy scale such as the Planck
scale. The problem is restated as the question whether it is possible to
construct a low-energy effective theory and the interaction with heavy
particles, without spoiling the structure of a high-energy physics supported by
an excellent concept. Based on this reinterpretation, we give a conjecture that
theories with hidden fermionic symmetries can be free from the gauge hierarchy
problem and become candidates of the physics beyond and/or behind the standard
model, and present toy models with particle-ghost symmetries as illustrative
examples and a prototype model for the grand unification.
