1. A handheld device, comprising: a touch display panel, being configured to display a user interface; and a processor electrically connected with the touch display panel, being configured to execute a homescreen management program according to a first touch signal sensed by the touch display panel, and enable the touch display panel to display a homescreen management interface corresponding to the homescreen management program, wherein the homescreen management interface comprises a page navigation area and a candidate object area, and wherein the page navigation area comprises a first page image corresponding to a first homescreen and a second page image corresponding to a second homescreen, and the candidate object area comprises an object image corresponding to an object; wherein the touch display panel is further configured to sense a pressing action to generate a second touch signal for the object image, and the processor is further configured to determine spaces of the first homescreen and the second homescreen for adding the object, and the object image is added into the first page image according to the second touch signal in response to the processor determines that the first homescreen contains available blank block for adding the object and correspondingly add the object into the first homescreen, and the processor configured to highlight the second page image with a first color in response to the processor determines that the second homescreen contains no available blank block for adding the object, wherein the pressing action is to press a first region of the touch display panel that corresponds to the object image and to slide to a second region corresponding to the first page image along a path between the object and the first page image.