Provided is a screen operation method for operating a character in a virtually 3-dimensional space displayed on a 2-dimensional screen. The method includes: inputting a movement command for an object by an input device; displaying on a movement amount display unit, a change of an object movement amount in accordance with the movement command; displaying accumulated effect by the object movement on an accumulated effect display unit; and executing the next event process in the virtually 3-dimensional space by an event generation unit when the accumulated effect has reached a predetermined value. Thus, it is possible to provide GUI exhibiting higher reality in an operation of a simulation game and the like and provide a new business of an online game in which a virtual game world is linked with a real service.