| 摘要 |
In an information management apparatus, a data receiving section receives position data periodically from a plurality of mobile terminals. A second extracting section generates a power set to at least one position data, and generates a node composed of identification data of a user and object data as elements. A processing section registers on a node, a movement data set having as an element, at least one of the position data showing a position before movement to a position shown by the object data and the position data showing a position after the movement from a position shown by the object data. An abstracting section abstracts the object data an abstraction scheme with a priority determined according to the number of times of abstraction. A testing section lists up other nodes, each of which is different from the node of the object data in identification data, and same as the node in the object data, and which has a movement data set, of which a product with the movement data set of the node is an empty set, and output the object data of the node as anonymity data when the number of other nodes is equal to or more than a predetermined threshold value. |
