Disclosed is a maternity biodata measurement system, wherein a sum of a pre-pregnancy energy expenditure and a pregnancy extra energy amount of a subject is determined as an energy amount necessary for the subject in a pregnancy period. In particular, the pregnancy extra energy amount is determined based on pre-pregnancy body-mass index data and elapsed pregnancy-period data about the subject, so as to allow the necessary energy amount to be determined as a value appropriate for the subject. The maternity biodata measurement system of the present invention makes it possible to measure a necessary energy amount for a pregnant woman on an individual basis.
