The present invention relates to a health context acquisition unit for acquiring health contexts from sensors of one or more IoT devices; A user manager for storing and managing information about the user; A health context manager for storing and managing a health context acquired from the health context acquisition unit; And converting the value of the health context acquired from the health context acquisition unit into a conversion value between 0 and 1 to normalize the value of the health context. When the value of the health context is within the normal range, the conversion value is 1, A health context normalizer in which the converted value has a value close to 0; And a health index expressing the health state of the body from one viewpoint, wherein weight information set for each health context is managed according to health context information for each health index, importance of each health context related to the health index, And a health index calcuator for calculating a health index by multiplying the converted value of the converted health context by the weighted value in the health context normalizer.;
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