A control method of an inputter comprises an operation in which at least one of the inputter and an electronic apparatus connected to the inputter acquires reference data, an operation in which a manipulation detector of the inputter outputs a manipulation detection signal, an operation in which a light source of the inputter irradiates a first light, an operation in which a light detector detects a first reflected light that is incident to the light detector among the irradiated first light, and an operation in which at least one of the inputter and the electronic apparatus compares a detection result of the first reflected light and the reference data, and identifies whether the manipulation detector outputting the manipulation signal malfunctions, based on a comparison result.