A radio protocol entity sharing apparatus and method are provided. Different cells share a second-layer protocol entity to use the same channel parameter values and the same protocol parameter values, thereby reducing a delay resulting from reestablishing a radio bearer in the event of a handover, minimizing data loss during handover, conserving network resources, and enhancing reception performance via soft combining. The method includes steps of receiving, in a mobile station, a first parameter value and a first parameter value indicator; establishing a channel using the first parameter value and the first parameter value indicator; receiving, in the mobile station, a second parameter value indicator; and maintaining the established channel if the first parameter value indicator is identical to the second parameter value indicator.