COMMUNICATION TERMINAL DEVICE, DEVICE FOR DETERMINING POSSIBILITY OF RECOGNIZING RELATION OF ASSUMED-NAME COMMUNICATION IDENTIFIER, COMMUNICATION SYSTEM, COMMUNICATION METHOD, AND STORAGE MEDIUM

摘要

To determine a relation discrimination possibility of a pseudonymous-name communication identifier so that, in each communication layer, no mismatch occurs between a pseudonymous-name communication identifier whose relation can be discriminated and a pseudonymous-name communication identifier whose relation cannot be discriminated. Relation discrimination possibility determination means 2 to determine a relation discrimination possibility of a pseudonymous-name communication identifier of a communication layer where a communication identifier needs to be converted into a pseudonymous name when communication is performed by the communication means 4 is provided. The determination means 2 determines a relation discrimination possibility of a pseudonymous-name communication identifier of a specific communication layer among a plurality of communication layers to a designated one of relation discrimination possible and relation discrimination impossible. It determines a relation discrimination possibility of a pseudonymous-name communication identifier of other communication layers to relation discrimination possible or relation discrimination impossible according to which one of relation discrimination possible and relation discrimination impossible the pseudonymous-name communication identifier of the specific communication layer is.