The present invention relates to a diet management system and method, wherein individual information data about users going through diet management are received and users are classified by body morphology, and a user-specific customised solution is provided in accordance with user body morphology classification-based diet targets, lifestyle analysis results and condition diagnostic data, and the user's current circumstances are received and a customised solution is provided that has been changed to match therewith. The present invention makes it possible to provide, in timely fashion, a solution wherein systemic diet management is effected that matches the characteristics of each individual person who is dieting, and wherein changes are effected so as to reflect the current condition of the person who is dieting.