Abstract: The present invention aims to provide a relationship estimation system capable of estimating a relationship of attributes meaningful to a person based on time-series data of attributes relating to a body or activities of a person. The relationship estimation system collects time-series data of attributes relating to a body or activity of a person, calculates similarity between time-series data of the attributes, and generates a relationship graph G in which the attributes are served as nodes, the similarity is served as a link weight, and the nodes are connected by the links. An inter-node having a large total link weight of the inter-node in the relationship graph G is extracted, and the relationship between attribute corresponding to the inter-node is estimated.