1. An apparatus for optical coherence tomography, the apparatus comprising: a light source configured to generate a plurality of beams; a light coupler configured to: split the plurality of beams into measurement beams and reference beams; transmit the measurement beams to a target object via a probe; and receive response beams from the probe; a detector configured to detect interference signals based on interference between the response beams and the reference beams; and an image processor configured to: generate a first image of the target object based on any one of the interference signals; and generate a second image of the target object having image characteristics different from those of the first image based on an other one of the interference signals.