A mobile communication system, comprising: a plurality of base stations (CS1, CS2, CS3,..., CSn), each of the base stations (CS1, CS2, CS3,..., CSn) capable of communicating with a mobile terminal; a handover timing detecting section (8, 18) adapted to detect a handover timing and a handover preparation timing based on quality of communication between the mobile terminal and a base station (CS1, CS2, CS3,..., CSn) connected to the mobile terminal; and a base station control apparatus connected to the base stations (CS1, CS2, CS3,..., CSn) and having a handover control section adapted to select at least a handover target candidate base station to which the mobile terminal connected to one of the base stations (CS1, CS2, CS3,..., CSn) hands over from the base stations (CS1, CS2, CS3,..., CSn); characterized in that after the handover timing detecting section (8, 18) detects the handover preparation timing when a strength of a radio wave is less than a second threshold which is higher than a first threshold, the handover control section determines one base station (CS1, CS2, CS3,..., CSn) as a handover target base station to which a mobile terminal connected to one of the base stations (CS1, CS2, CS3,..., CSn) hands over from the base stations (CS1, CS2, CS3,..., CSn), and the base station control apparatus connects a call between the base station control apparatus and the base station (CS1, CS2, CS3,..., CSn) determined as the handover target base station; after the handover timing detecting section (8, 18) detects the handover timing when a strength of the radio wave is less than the first threshold, the handover control section directs the mobile terminal to hand over to the base station (CS1, CS2, CS3,..., CSn) determined as the handover target base station; and the base station control apparatus further includes a base station information table storing base station information for each base station (CS1, CS2, CS3,..., CSn) connected to the base station control apparatus, and a base station information management section adapted to update the base station information table when the mobile terminal has handed over; and wherein the handover control section determines the handover target base station based on the base station information table. a plurality of base stations (CS1, CS2, CS3,..., CSn), each of the base stations (CS1, CS2, CS3,..., CSn) capable of communicating with a mobile terminal; a handover timing detecting section (8, 18) adapted to detect a handover timing and a handover preparation timing based on quality of communication between the mobile terminal and a base station (CS1, CS2, CS3,..., CSn) connected to the mobile terminal; and a base station control apparatus connected to the base stations (CS1, CS2, CS3,..., CSn) and having a handover control section adapted to select at least a handover target candidate base station to which the mobile terminal connected to one of the base stations (CS1, CS2, CS3,..., CSn) hands over from the base stations (CS1, CS2, CS3,..., CSn); characterized in that after the handover timing detecting section (8, 18) detects the handover preparation timing when a strength of a radio wave is less than a second threshold which is higher than a first threshold, the handover control section determines one base station (CS1, CS2, CS3,..., CSn) as a handover target base station to which a mobile terminal connected to one of the base stations (CS1, CS2, CS3,..., CSn) hands over from the base stations (CS1, CS2, CS3,..., CSn), and the base station control apparatus connects a call between the base station control apparatus and the base station (CS1, CS2, CS3,..., CSn) determined as the handover target base station; after the handover timing detecting section (8, 18) detects the handover timing when a strength of the radio wave is less than the first threshold, the handover control section directs the mobile terminal to hand over to the base station (CS1, CS2, CS3,..., CSn) determined as the handover target base station; and the base station control apparatus further includes a base station information table storing base station information for each base station (CS1, CS2, CS3,..., CSn) connected to the base station control apparatus, and a base station information management section adapted to update the base station information table when the mobile terminal has handed over; and wherein the handover control section determines the handover target base station based on the base station information table.