An information processing device comprising: a first acquisition unit that acquires first biological data which is biological feature data of a collated object and attribute information relating to the first biological data; a collation unit that refers to a collation data storage unit that stores a plurality of pieces of second biological data which are biological feature data for use in collating the first biological data, and collates the first biological data with each piece of the second biological data; a second acquisition unit that acquires attribute information for each piece of the second biological data from an attribute information storage unit that stores attribute information associated with each piece of the second biological data; a specification unit that compares the attribute information acquired together with the first biological data with the attribute information associated with each piece of the second biological data, and specifies at least one of the pieces of second biological data corresponding to the first biological data, on the basis of both similarity of biological data and similarity of attribute information, the similarity of attribute information resulting from comparing the attribute information relating to the first biological data with the attribute information associated with each piece of the second biological data and the similarity of biological data resulting from collating the first biological data with each piece of the second biological data; and an accumulation unit that accumulates the attribute information acquired together with the first biological data, as attribute information to be associated with the specified second biological data, in the attribute information storage unit, wherein individual authentication is performed from the second biological data and first biological data, and wherein the specification unit is adapted to determine, among the specified pieces of second biological data in which the biological similarity exceeds a predetermined threshold, a priority of the specified pieces to become higher as the attribute similarity of second biological data becomes higher. a first acquisition unit that acquires first biological data which is biological feature data of a collated object and attribute information relating to the first biological data; a collation unit that refers to a collation data storage unit that stores a plurality of pieces of second biological data which are biological feature data for use in collating the first biological data, and collates the first biological data with each piece of the second biological data; a second acquisition unit that acquires attribute information for each piece of the second biological data from an attribute information storage unit that stores attribute information associated with each piece of the second biological data; a specification unit that compares the attribute information acquired together with the first biological data with the attribute information associated with each piece of the second biological data, and specifies at least one of the pieces of second biological data corresponding to the first biological data, on the basis of both similarity of biological data and similarity of attribute information, the similarity of attribute information resulting from comparing the attribute information relating to the first biological data with the attribute information associated with each piece of the second biological data and the similarity of biological data resulting from collating the first biological data with each piece of the second biological data; and an accumulation unit that accumulates the attribute information acquired together with the first biological data, as attribute information to be associated with the specified second biological data, in the attribute information storage unit,