An antenna switching control unit for controlling the switching of antennas of an apparatus, the apparatus comprising two antennas (6, 7), a first communication unit made to carry out a radio communication, a second communication unit made to carry out radio communication using a diversity function whereby said two antennas are controllable, and a switching unit (8, 8A) made to switch connection states of said two antennas (6, 7) to said first and second communication units (4, 5), wherein said antenna switching control unit is operable to control said switching unit to switch the connection states, characterized in that the antenna switching control unit comprises: an inputting unit manipulated by an operator for inputting switching instruction information for switching said connection states through said switching unit (8, 8A); a switching controlling unit for controlling said switching unit (8, 8A) in accordance with said switching instruction information inputted from said inputting unit to switch said connection states such that, when each of said first and said second communication units (4, 5) makes a radio communication including transmission and reception, the first and second communication units (4, 5) making the radio communications simultaneously and independently of each other, one of said first and second communication units (4, 5) is connected to one said antenna (6, 7) and the other of the first and second communication units (4, 5) is connected to the other said antenna of the two antennas, and, when radio communications are made through the use of said second communication unit but not said first communication unit, said two antennas (6, 7) are connected to said second communication unit; and a reception state providing means for providing, to said operator, an electric-wave reception state on said first communication unit and/or said second communication unit in use to provide, to the operator, information on whether or not a problem exists when the connection state is switched by said switching unit (8, 8A). an inputting unit manipulated by an operator for inputting switching instruction information for switching said connection states through said switching unit (8, 8A); a switching controlling unit for controlling said switching unit (8, 8A) in accordance with said switching instruction information inputted from said inputting unit to switch said connection states such that, when each of said first and said second communication units (4, 5) makes a radio communication including transmission and reception, the first and second communication units (4, 5) making the radio communications simultaneously and independently of each other, one of said first and second communication units (4, 5) is connected to one said antenna (6, 7) and the other of the first and second communication units (4, 5) is connected to the other said antenna of the two antennas, and, when radio communications are made through the use of said second communication unit but not said first communication unit, said two antennas (6, 7) are connected to said second communication unit; and a reception state providing means for providing, to said operator, an electric-wave reception state on said first communication unit and/or said second communication unit in use to provide, to the operator, information on whether or not a problem exists when the connection state is switched by said switching unit (8, 8A).