1. A video signal processing apparatus for an endoscope, the video signal processing apparatus including an attachable/detachable endoscope including an image pickup section for picking up an image of a subject, and including a signal processing circuit capable of generating a video signal, the video signal processing apparatus comprising: a data reading section that reads parameter data unique to the endoscope from a memory provided in the endoscope; an error determination section that determines whether or not the parameter data read by the data reading section has an error; and a control section that, if a result of determination by the error determination section indicates that the parameter data has an error, controls the signal processing circuit according to a type of the parameter data having the error.