A resource sharing device and control method thereof. The resource sharing device is electrically coupled to a plurality of computers and a mouse. The mouse is used to control a mouse cursor, and each computer is electrically coupled to a display. The steps include: identifying the spatial arrangement and resolutions of the displays; the computers initializing the respective positions of the mouse cursor; receiving a mouse displacement generated by the mouse; generating a mouse cursor displacement according to the mouse displacement and an acceleration setting; transmitting the mouse cursor displacement to one of the computers; determining whether the mouse cursor reaches a threshold; when the determination is affirmative, switching the mouse control to another computer.