Provided is an information processing apparatus in an OCT system capable of acquiring tomographic information and moving velocity information of an object at high speed and over a region larger than a spot size. The apparatus splits light including a plurality of lights of at least first and second light into measurement lights and reference lights and acquires tomographic information and moving velocity information of an object, having: a scanning optical system for scanning with the measurement light an optical system for applying the measurement light to different spot positions interference signal generating devices which generate first and second interference signals from a return light obtained when the measurement light is applied to the positions and the reference light reflected by a reference mirror and a signal processing device which calculates a variation in phase using the interference signals and computes a moving velocity of the object.
