To provide a management system and a simple method for measuring a body weight which takes over conventional weight measurements and is in the fashion of being fit in one's daily life, and provide a system useful to a prevention of adult diseases by finally motivating individuals to control their life habits through weight managements.

A weighing machine system includes: a plurality of sensing means forming a flexible sheet structure, each being arranged on a flat surface and independent of another in order to measure a load applied to itself; and an arithmetic means for calculating a summation of loads based on outputs of the sensing means.