1. A method for making a program cause a computer to function as a handwriting input device which comprises: a table for storing execution commands corresponding to types of gestures therein; a display unit having a display screen; a handwriting input unit for accepting handwriting input including gesture input; and a coordinate value acquisition unit for acquiring coordinate values of the handwriting input accepted by said handwriting input unit, wherein the display unit displays handwriting corresponding to handwriting input including the gesture accepted by said handwriting input, said method comprising the steps of: deciding whether or not said handwriting input unit is accepting handwriting input; updating display data of handwriting when it is decided that said handwriting input unit is accepting handwriting input; deciding whether or not said handwriting input is gesture input when it is decided that the accepting of handwriting input in said handwriting input unit is not completed; deciding whether or not the accepting of handwriting input in said handwriting input unit is completed; deciding the type of gesture on the basis of the coordinate values acquired by said coordinate value acquisition unit when it is decided that the handwriting input is gesture input; reading an execution command corresponding to the decided type of gesture from said table; displaying on said display unit the fact that the input is gesture input; deciding whether or not gesture input is completed; and executing the execution command corresponding to said gesture input when it is decided that gesture input is completed; deciding whether or not coordinate values acquired by said coordinate value acquisition unit are constant; deciding whether or not the state where it is decided that the coordinate values keep constant for a predetermined time when input is decided as gesture input; changing decision result to the result that the input is not gesture input when it is decided the predetermined time is elapsed; and updating display on said display screen of said display unit to display showing the fact that the input is not gesture input.