Patent ID: 7952465

Claim:
A wireless tag determination system comprising: a detection information storage configured to store a tag ID detected from a wireless tag by a tag reader and a time when the tag reader detects the tag ID, as detection information; a reliability determination unit configured to determine reliability which indicates certainty of existence of the wireless tag within a detection range of the tag reader at a time subsequent to a time of an initial detection of the wireless tag; and a determination requesting unit configured to request a reliability determination for reliability of existence of the wireless tag within a detection range of the tag reader, wherein the reliability determination unit comprises an elapsed time calculator configured to calculate elapsed time information indicating an elapsed time which is from a time of the last detection of the wireless tag to a time when the determination requesting unit requests the reliability determination, by use of the detection information stored in the detection information storage; a periodicity information holder configured to hold periodicity information indicating a transmission cycle of the wireless tag; and an attribute information holder configured to hold attribute information indicating an attribute of an object to which the wireless tag is attached, wherein the reliability determination unit includes, a non-detection frequency calculator configured to calculate, by use of the periodicity information, non-detection frequency information indicating the number of times that the wireless tag is not detected during the elapsed time, at time points when the wireless tag is supposed to be detected, a mobility probability determination unit configured to determine a mobility probability representing a frequency of movements of the object to which the wireless tag is attached, in accordance with the attribute information held by the attribute information holder, and a reliability calculator configured to calculate the reliability in accordance with the elapsed time information calculated by the elapsed time calculator, the mobility probability determined by the mobility probability determination unit, the attribute information held by the attribute information holder, and the non-detection frequency information calculated by the non-detection frequency calculator.