Patent ID: 7373280

Claim:
A method of detecting a measurement error, the method comprising: receiving measurement data from a measurement unit and user expression data; relating each of the received measurement data and expression data to corresponding ones of a plurality of sections classifying values of the measurement data and the expression data, based on values of the received measurement data and expression data; and checking whether the data corresponding to the sections to which the measurement and expression data are related are consistent with each other, to detect an error in the measurement data or the expression data when the data are not consistent, wherein the error detecting includes checking whether the data in the sections to which the measurement and expression data are related are consistent with each other; receiving remeasurement data from the measurement unit when the data of the sections to which the measurement and expression data are related are not consistent; and comparing the measurement data with the remeasurement data, to determine that the measurement unit has an error when the measurement and remeasurement data are not consistent, and to determine that the user expression data has an error when the measurement and remeasurement data are consistent.