A window arrangement method includes the following steps. The method obtains the first program identifier of a foreground window. The method determines whether the first program identifier belongs to a preset identifier. In response to the first program identifier belonging to the preset identifier, the method obtains the first handle and the first window data of the foreground window and sets the application handle of a window arrangement application as the parent window handle of the first handle. The first toolbar or the first address bar of the foreground window is removed through the window arrangement application to generate a first simplified window. Moreover, the first simplified window is displayed in a window of the window arrangement application through the window arrangement application according to the first window data and the first default window position.