There is provided an antenna characteristic measuring system which includes a measuring point scanner to scan a measuring point, an antenna gain measuring device which measures an antenna gain of a measured antenna at a plurality of the measuring points, determines a reference point among the plurality of the measuring points, and obtains antenna gain difference values between the antenna gain at the reference point and each of the antenna gain at the plurality of the measuring points other than the reference point, and an antenna characteristic measuring device which measures a reference antenna characteristic of the measured antenna at the reference point and obtains an antenna characteristic of the measured antenna at each of the plurality of the measuring points other than the reference point by correcting the reference antenna characteristic with each of the difference values.