1. A method for controlling a computerized device by a multi-contact touch screen, the method comprising: displaying first and second graphical objects on the multi-contact touch screen at first and second object positions, respectively; associating first and second specific processing rules to the first and second graphical objects, respectively; detecting first and second touch points on the multi-contact touch screen and defining first and second touch positions for the first and second touch points, respectively; applying the first specific processing rule of the first graphical object as a function of a relative position between the first touch position and the first object position; applying the second specific processing rule of the second graphical object as a function of a relative position between the second touch position and the second object position; modifying at least one of the first graphical object or the first object position based on a result of said applying the first specific processing rule; and modifying at least one of the second graphical object or the second object position based on a result of said applying the second specific processing rule.