A first determination region, a second determination region, and a third determination region are set for each non-operation target object. When an operation target object is located within the first determination region, it is determined that the operation target object has collided with the non-operation target object, and a process is performed. In addition, when a touch input is performed in a state where the operation target object is located within the second determination region, it is determined that the operation target object has collided with the non-operation target object, and a process is performed at this time. Moreover, when the operation target object is located within the third determination region, movement control of the operation target object is performed such that the operation target object avoids a collision with the non-operation target object.