Patent ID: 8366545

Claim:
A screen operation system for operating an object in a virtual space displayed in a two-dimensional screen, comprising: an input unit operable to input a movement instruction to the object; a movement amount display unit operable to display a variation in the movement amount of the object in response to the movement instruction; an accumulated effect display unit operable to display accumulated effect in accordance with the movement of the object; and an event generation unit operable to invoke a next event process in the virtual space when the accumulated effect has reached a predetermined value, wherein the input unit is provided with a button for clicking, the operation of depressing the button is regarded as an instantaneous movement amount, and the effect is accumulated during maintaining the depressed condition, when the button is released from the depressed state, the variation in the movement amount is released and the accumulation of effect is halted; wherein the variation in the movement amount is represented by the diameter of a circle; and wherein the accumulation of effect is represented by the increment/decrement number of an arc-shaped gauge on the circle.