1. A motion capture apparatus, comprising: a three-dimensional (3D) appearance reconstruction unit for reconstructing a 3D appearance of an entity using a multi-view image obtained by capturing the entity at a T+1-th frame; a 3D skeleton generation unit for generating a 3D skeleton of the T+1-th frame using the 3D appearance and a model of the entity having a motion of a T-th frame; and a motion reconstruction unit for reconstructing a motion of the T+1-th frame of the model by changing the motion of the model based on the 3D skeleton of the T+1-th frame, wherein the 3D skeleton generation unit comprises: a cross-section generation unit for generating a cross-section of the model of the entity having the motion of the T-th frame and a cross-section of the 3D appearance of the entity in a direction of a normal line relative to a longitudinal direction of a skeleton of the model of the entity; an ellipse fitting unit for generating an ellipse by elliptically fitting the cross-section of the model; and a skeleton location estimation unit for searching for an optimal location of the ellipse based on the cross-section of the 3D appearance, thus estimating a location of the skeleton of the model.