A control method for a washing machine including a wireless communication unit for communicating with an electronic device includes: causing the washing machine to operate a washing tub of the washing machine as a preliminary operation; acquiring motion information regarding a motion of the electronic device during the preliminary operation; determining whether or not the electronic device is inside the washing tub based on the acquired motion information and information indicating the preliminary operation; and giving the washing machine a notification indicating that the electronic device is inside the washing tub if the determining step determines that the electronic device is inside the washing tub.