User interest estimation system and information delivery system

A user interest estimation system that estimates user's interest based on photographic data of a commodity or service photographed by an information terminal device of a user, comprising:

• an estimation device configured to estimate the user's interest;
• a context information database connected to the estimation device in a communicable state and configured to store geographical or spatial context information associated with a time and/or location;
• an object information database connected to the estimation device in a communicable state and configured to store object information related to a commodity or service associated with a time and/or location;
• and
• an interest information database connected to the estimation device in a communicable state and configured to store interest information of the user,
• wherein the estimation device includes
• a photographic data reception unit configured to receive photographic data related to a commodity or service transmitted from the information terminal device of the user via a network,
• a context information acquisition unit configured to acquire geographical or spatial context information pertaining to a time and/or location included in the photographic data received by the photographic data reception unit by referring to the context information database,
• an object information acquisition unit configured to acquire object information related to a commodity or service pertaining to a time and/or location included in the photographic data received by the photographic data reception unit by referring to the object information database, and
• an interest information generation unit configured to generate the interest information of the user by correlating the context information acquired by the context information acquisition unit with the object information acquired by the object information acquisition unit.