1. An MTF measuring system for calculating an MTF to be an index for evaluating a lens performance by MTF calculating means to acquire MTF data based on object image data obtained by photographing an object through a lens, and generating MTF curve image data indicative of an MTF curve based on the MTF data thus acquired, comprising: measuring result screen generating means for generating measuring result screen data indicative of an object image and an MTF curve image based on the object image data and the MTF curve image data; and display control means for displaying a measuring result screen on a display portion based on the measuring result screen data generated by the measuring result screen generating means.