A game apparatus, comprising: an input accepting means for accepting an operation input from a player; an object arranging means for arranging a first object and a second object in a first virtual game world, and performing a movement control on at least one of the first object and the second object; a first game image display controlling means for generating a game image panoramically or planarly representing the first virtual game world on the basis of an arrangement state by the object arranging means, and displaying it on a first display portion; an object action state determining means for determining an action or a state of at least one of said first object and said second object in said first virtual game world in response to the operation input accepted by said input accepting means; and a determining means for determining whether or not a positional relationship between the first object and the second object satisfies a predetermined condition in the first virtual game world; wherein the first game image display controlling means generates a two-dimensional game image, and the game apparatus further comprises a second game image display controlling means for arranging at least one of the first object and the second object in a three-dimensional second virtual game world at three-dimensional positions calculated on the basis of their two-dimensional coordinates in the first virtual game world and, when the determination result by said determining means is affirmative, setting a virtual camera in the three-dimensional second virtual game world on the basis of at least one of a first object position and a second object position in the first virtual game world, generating a three-dimensional game image by shooting the second virtual game world with the virtual camera in such a manner as to include at least one of said first object and said second object, and displaying the three-dimensional game image on a second display portion concurrently with the two-dimensional game image of the first virtual game world displayed in said first display portion, a camera position determining means for determining the position of said virtual camera on the basis of said first object position in the first virtual game world when the determination result by said determining means is affirmative, and a camera direction determining means for determining the direction of said virtual camera in such a manner as to shoot said first object and said second object. an input accepting means for accepting an operation input from a player; an object arranging means for arranging a first object and a second object in a first virtual game world, and performing a movement control on at least one of the first object and the second object; a first game image display controlling means for generating a game image panoramically or planarly representing the first virtual game world on the basis of an arrangement state by the object arranging means, and displaying it on a first display portion; an object action state determining means for determining an action or a state of at least one of said first object and said second object in said first virtual game world in response to the operation input accepted by said input accepting means; and a determining means for determining whether or not a positional relationship between the first object and the second object satisfies a predetermined condition in the first virtual game world; wherein the first game image display controlling means generates a two-dimensional game image, and the game apparatus further comprises a second game image display controlling means for arranging at least one of the first object and the second object in a three-dimensional second virtual game world at three-dimensional positions calculated on the basis of their two-dimensional coordinates in the first virtual game world and, when the determination result by said determining means is affirmative, setting a virtual camera in the three-dimensional second virtual game world on the basis of at least one of a first object position and a second object position in the first virtual game world, generating a three-dimensional game image by shooting the second virtual game world with the virtual camera in such a manner as to include at least one of said first object and said second object, and displaying the three-dimensional game image on a second display portion concurrently with the two-dimensional game image of the first virtual game world displayed in said first display portion, a camera position determining means for determining the position of said virtual camera on the basis of said first object position in the first virtual game world when the determination result by said determining means is affirmative, and a camera direction determining means for determining the direction of said virtual camera in such a manner as to shoot said first object and said second object.