Patent ID: 7123126

Claim:
A monitoring method comprising: acquiring tag identification information that is unique to a radio frequency identification tag carried by a person, and reader identification information that is unique to a tag reader capable of detecting the radio frequency identification tag in a predetermined area; recording positional history that indicates position of the radio frequency identification tag at a certain time based on timing at which the tag identification information and the reader identification information are acquired; acquiring a set of the tag identification information and the reader identification information corresponding to a predetermined time based on the positional history, wherein the acquiring of the tag identification information and the reader identification information is performed at the acquiring based on the set of the tag identification information and the reader identification information; acquiring attribute information that is information about the person carrying the radio frequency identification tag based on the tag identification information acquired; acquiring area information that is information about the predetermined area based on the reader identification information; and determining whether the person carrying the radio frequency identification tag is allowed to enter the predetermined area based on the attribute information and the area information.