PROBLEM TO BE SOLVED: To count a mastication frequency without mounting an instrument on a user.SOLUTION: Sound data obtained by collecting sound while a user is taking a meal and weight data obtained by measuring the change of the weight of the meal during taking the meal are input. A section where mastication sound is recorded is extracted from sound data. A section during a mastication action is extracted on the basis of the weight change of the weight data. Then, a mastication frequency is calculated. Consequently, a part erroneously recognized as mastication sound can be removed based on the weight change of the meal. Thus, the mastication frequency is correctly calculated based on the sound data collected by a microphone 21 arranged on a table without mounting an instrument on the user.
