There is provided a computer that can implement an operation object display output function, a target object display output function, and a form determination function. The operation object display output function can be a function of outputting operation object display information with which an operation object having a certain form is displayed so as to be visible from a certain direction in a graphical scene of a game having three-dimensional information. The target object display output function can be a function of outputting target object display information with which a target object having a form relating to the certain form is displayed. The form determination function may be a function of determining whether the operation object and the target object correspond to each other by comparing the form of the operation object with the form of the target object.