System for controlling the charging state of an electric vehicle and a method for controlling the charging state thereof

In an electric vehicle which drives at least one external device with power of a battery for driving an electric motor, an available power amount information is set based on the power of the battery. A usage information to at least one usage devices selected by a user among the at least one external device is provided from a server or a smart device, and the usage information is matched with a preset load power data. A usage device calculates the predicted power amount information on the usage device based on a matched use information and an available power amount information, and provides the predicted power amount information to the smart device. When information on a destination is inputted by a user, a plurality of driving routes capable of driving to the destination are set on the basis of the predicted power amount information.