1. A method for evaluating attention degree in a three-dimensional (3D) virtual world, the 3D virtual world comprising at least one virtual object and at least one avatar controlled by a user, the at least one avatar having a corresponding avatar view field, the method comprising: obtaining geometrical information about the avatar view field and geometrical information about the at least one virtual object; determining an association between the avatar view field and the at least one virtual object based on the geometrical information; evaluating an attention degree of the at least one virtual object based on the association; and providing an evaluation result for the attention degree of the at least one virtual object.