1. A display apparatus comprising:
a measuring unit that measures an effective image area of an input analog video signal;
a determining unit that calculates an overlapping ratio of the measured effective image area and an effective image area of
a candidate format using information relating to the measured effective image area and information relating to the effective
image area of the candidate format, and determines whether or not the candidate format is a format of the input analog video
signal using the calculated overlapping ratio of the candidate format and other overlapping ratios calculated from other candidate
a conversion unit that converts the input analog video signal to a digital signal using a sampling clock frequency specified
by the candidate format, when the candidate format is determined as the format of the input analog video signal.