Abstract: An attitude of an object arranged in a virtual world is controlled based on attitude data outputted from a portable display device. Further, the object is caused to move in the virtual world, based on data based on a load applied to a load detection device. Then, a first image showing the virtual world including at least the object is displayed on the portable display device.

Abstract: An object arranged in a virtual world is caused to move in accordance with data based on a load applied to a load detection device. Then, based on attitude data outputted from a portable display device and a position of the object in the virtual world, a first virtual camera for generating an image of the virtual world is controlled, and a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display device.

Abstract: A movement direction of an object arranged in a virtual world is set based on attitude data. Further, the object is moved in the movement direction in the virtual world in accordance with data based on a load applied to a load detection device. An image showing the virtual world including at least the object or an image showing the virtual world viewed from the object is displayed as a first image on a portable display device.

Abstract: On the basis of data output from a portable display apparatus, a direction of rotation of the portable display apparatus about a predetermined direction in real space is calculated. Attitudes of an object, placed in a virtual world, and a first virtual camera, for generating an image of the virtual world including at least the object, are controlled such that the object and the first virtual camera rotate in the direction of rotation about a direction that corresponds to the predetermined direction and is set in the virtual world. Then, a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display apparatus.

Abstract: On the basis of data output from a portable display apparatus, it is determined whether or not a direction of a predetermined axis set in the portable display apparatus is included in a predetermined range. When it has been determined that the direction of the predetermined axis is included in the predetermined range, an action of an object placed in a virtual world is controlled in accordance with the direction of the predetermined axis. Further, when the direction of the predetermined axis is included in the predetermined range or present outside the predetermined range, an action of a first virtual camera for generating an image of the virtual world is controlled in accordance with the direction of the predetermined axis. Then, a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display apparatus.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, at least a direction of rotation and an amount of rotation of the portable display apparatus about a predetermined direction in real space are calculated, and a corrected amount of rotation is calculated by correcting the calculated amount of rotation by a predetermined factor. Then, an operation indication direction based on the direction of rotation and the corrected amount of rotation is calculated with respect to a direction that corresponds to the predetermined direction and is set in a virtual world, and predetermined processing is performed on the virtual world. A first image including at least a part of the virtual world is displayed on the portable display apparatus.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, at least a direction of rotation and an amount of rotation of the portable display apparatus about a predetermined direction in real space are calculated, and a corrected amount of rotation is calculated by offsetting the calculated amount of rotation by a predetermined amount. Then, an operation indication direction based on the direction of rotation and the corrected amount of rotation is calculated with respect to a direction that corresponds to the predetermined direction and is set in a virtual world, and predetermined processing is performed on the virtual world. A first image including at least a part of the virtual world is displayed on the portable display apparatus.

Abstract: Data which is output from an input device capable of allowing a body of a user to get thereon and is based on a load applied on the input device is usable. Data is acquired from the input device is processed. A center-of-gravity position of a load applied on the input device is repeatedly acquired based on data output from the input device. A user direction a stepping action made on the input device is calculated using the center-of-gravity position. Predetermined processing is performed based on the user direction.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, an action of a player object placed in a virtual world is controlled, and on the basis of a position and/or an attitude of the player object, it is determined whether or not the player object has received an attack. Further, when the player object has received a predetermined attack, an attack effect image representing an effect of the predetermined attack is generated, and a first image is generated by superimposing the attack effect image on an image of the virtual world and displayed on the portable display apparatus. Then, the effect of the predetermined attack in an area in the attack effect image is repaired, the area overlapping a predetermined range whose center is a touch position on a touch panel.

Abstract: A discharge direction in which a discharge object is to be discharged from a predetermined position in a virtual world is set on the basis of data output from a portable display apparatus. Then, the discharge object is discharged in the discharge direction from the predetermined position on the basis of data based on a load applied to a load detection device, and an image representing at least a part of the discharge object that is being discharged in the virtual world is displayed as a first image on the portable display apparatus.

Abstract: An attitude of an object arranged in a virtual world is controlled based on attitude data outputted from a portable display device. Further, the object is caused to move in the virtual world, based on data based on a load applied to a load detection device. Then, a first image showing the virtual world including at least the object is displayed on the portable display device.

Abstract: An object arranged in a virtual world is caused to move in accordance with data based on a load applied to a load detection device. Then, based on attitude data outputted from a portable display device and a position of the object in the virtual world, a first virtual camera for generating an image of the virtual world is controlled, and a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display device.

Abstract: Data which is output from an input device capable of allowing a body of a user to get thereon and is based on a load applied on the input device is usable. Data is acquired from the input device is processed. A center-of-gravity position of a load applied on the input device is repeatedly acquired based on data output from the input device. A user direction a stepping action made on the input device is calculated using the center-of-gravity position. Predetermined processing is performed based on the user direction.

Abstract: On the basis of data output from a portable display apparatus, a direction of rotation of the portable display apparatus about a predetermined direction in real space is calculated. Attitudes of an object, placed in a virtual world, and a first virtual camera, for generating an image of the virtual world including at least the object, are controlled such that the object and the first virtual camera rotate in the direction of rotation about a direction that corresponds to the predetermined direction and is set in the virtual world. Then, a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display apparatus.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, an action of a player object placed in a virtual world is controlled, and on the basis of a position and/or an attitude of the player object, it is determined whether or not the player object has received an attack. Further, when the player object has received a predetermined attack, an attack effect image representing an effect of the predetermined attack is generated, and a first image is generated by superimposing the attack effect image on an image of the virtual world and displayed on the portable display apparatus. Then, the effect of the predetermined attack in an area in the attack effect image is repaired, the area overlapping a predetermined range whose center is a touch position on a touch panel.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, at least a direction of rotation and an amount of rotation of the portable display apparatus about a predetermined direction in real space are calculated, and a corrected amount of rotation is calculated by correcting the calculated amount of rotation by a predetermined factor. Then, an operation indication direction based on the direction of rotation and the corrected amount of rotation is calculated with respect to a direction that corresponds to the predetermined direction and is set in a virtual world, and predetermined processing is performed on the virtual world. A first image including at least a part of the virtual world is displayed on the portable display apparatus.

Abstract: A movement direction of an object arranged in a virtual world is set based on attitude data. Further, the object is moved in the movement direction in the virtual world in accordance with data based on a load applied to a load detection device. An image showing the virtual world including at least the object or an image showing the virtual world viewed from the object is displayed as a first image on a portable display device.

Abstract: On the basis of data based on an attitude and/or a motion of a portable display apparatus body, at least a direction of rotation and an amount of rotation of the portable display apparatus about a predetermined direction in real space are calculated, and a corrected amount of rotation is calculated by offsetting the calculated amount of rotation by a predetermined amount. Then, an operation indication direction based on the direction of rotation and the corrected amount of rotation is calculated with respect to a direction that corresponds to the predetermined direction and is set in a virtual world, and predetermined processing is performed on the virtual world. A first image including at least a part of the virtual world is displayed on the portable display apparatus.

Abstract: On the basis of data output from a portable display apparatus, it is determined whether or not a direction of a predetermined axis set in the portable display apparatus is included in a predetermined range. When it has been determined that the direction of the predetermined axis is included in the predetermined range, an action of an object placed in a virtual world is controlled in accordance with the direction of the predetermined axis. Further, when the direction of the predetermined axis is included in the predetermined range or present outside the predetermined range, an action of a first virtual camera for generating an image of the virtual world is controlled in accordance with the direction of the predetermined axis. Then, a first image representing the virtual world viewed from the first virtual camera is displayed on the portable display apparatus.