1. An electric-power-generating-facility operation management support system, comprising: an analyzing unit that calculates operation plan creating basic information based upon received information with regard to lifespan calculating expressions, present electric-power market information, and operation-history information with regard to an electric power generation; and an operation plan creating unit that calculates and outputs operational conditions of electric power generating facilities as a created operation planning based upon said operation plan creating basic information calculated by said analyzing unit, said analyzing unit comprising a lifespan-consumption-costs calculating unit that calculates lifespan consumption costs of said electric power generating facilities, a reserve-electric-power-price estimating unit that estimates a market price of reserve electric power, and a reserve-electric-power supply-probability estimating unit that estimates a probability of a supply of the reserve electric power.