1. An apparatus for forecasting a geostationary satellite anomaly, the apparatus comprising: a storage unit configured to store (a) at least one piece of space environmental information, (b) satellite information, and (c) satellite anomaly event information; and an estimation unit configured to estimate a satellite anomaly susceptibility to a space environmental phenomenon based on (a) the at least one piece of space environmental information, (b) the satellite information, and (c) the satellite anomaly event information, wherein the satellite anomaly susceptibility is estimated based on a ratio of a number of satellite anomaly events divided by a number of proton fluxes.