A following coordinate which follows an input coordinate late is calculated. Then, an inference moving amount is calculated on the basis of a moving amount of an input coordinate, and an inference moving direction is calculated on the basis of a moving direction of the following coordinate. An inference movement vector is set on the basis of the inference moving amount and inference moving direction calculated thus. The following coordinate has low correlation with an actual moving amount of a finger of an operator, and the moving direction of the input coordinate has low correlation with an actual moving direction of the finger of the operator due to fluctuation of the input coordinate. Thus, the inference movement vector which is set as described above more accurately reflects the actual moving amount and moving direction of the finger of the operator.