A two-leg MLM organization construction system encourages a member who puts in effort in recruiting members by offering a chance to drastically increase bonus earnings. New first and second positions are provided between the position of the upper level member and the positions that are immediate right and left to the upper level member. These new first and second positions are initially set to an OFF-state position. When the number of positions filled with recruited members reaches a predetermined level, the new first and second positions are turned to on ON-state position.