A turbine bypass control apparatus for a turbine connected between a high-pressure side header and a low-pressure side header and driven by steam which flows from said high-pressure side header to said low-pressure side header, comprising: first and second bypass valves connected between said high-pressure side header and said low-pressure side header in parallel to said turbine; and a control unit configured to: control openings of said first and second bypass valves based on a higher operation amount signal as one of first and second operation amount signals, which indicates a higher operation amount, in an automatic mode before start of a trip of said turbine; and control said first bypass valve to be rapidly opened, track the first operation amount signal based on a second opening signal, and track the second operation amount signal based on a first opening signal, in a manual mode during a first time period from the start of the trip of said turbine, wherein said first and second bypass valves are manually controlled in the manual mode, and wherein in the automatic mode, said control unit generates the first operation amount signal based on a first pressure setting signal indicating a setting steam pressure of said high-pressure side header, a first detection signal indicating a steam pressure of said high-pressure side header, and the second opening signal indicating the opening of said second bypass valve, and generates the second operation amount signal based on a second pressure setting signal indicating a setting steam pressure of said low-pressure side header, a second detection signal of a steam pressure of said low-pressure side header, and the first opening signal indicating the opening of said first bypass valve. first and second bypass valves connected between said high-pressure side header and said low-pressure side header in parallel to said turbine; and a control unit configured to: control openings of said first and second bypass valves based on a higher operation amount signal as one of first and second operation amount signals, which indicates a higher operation amount, in an automatic mode before start of a trip of said turbine; and control said first bypass valve to be rapidly opened, track the first operation amount signal based on a second opening signal, and track the second operation amount signal based on a first opening signal, in a manual mode during a first time period from the start of the trip of said turbine, wherein said first and second bypass valves are manually controlled in the manual mode, and wherein in the automatic mode, said control unit generates the first operation amount signal based on a first pressure setting signal indicating a setting steam pressure of said high-pressure side header, a first detection signal indicating a steam pressure of said high-pressure side header, and the second opening signal indicating the opening of said second bypass valve, and generates the second operation amount signal based on a second pressure setting signal indicating a setting steam pressure of said low-pressure side header, a second detection signal of a steam pressure of said low-pressure side header, and the first opening signal indicating the opening of said first bypass valve. control openings of said first and second bypass valves based on a higher operation amount signal as one of first and second operation amount signals, which indicates a higher operation amount, in an automatic mode before start of a trip of said turbine; and control said first bypass valve to be rapidly opened, track the first operation amount signal based on a second opening signal, and track the second operation amount signal based on a first opening signal, in a manual mode during a first time period from the start of the trip of said turbine, wherein said first and second bypass valves are manually controlled in the manual mode, and wherein in the automatic mode, said control unit generates the first operation amount signal based on a first pressure setting signal indicating a setting steam pressure of said high-pressure side header, a first detection signal indicating a steam pressure of said high-pressure side header, and the second opening signal indicating the opening of said second bypass valve, and generates the second operation amount signal based on a second pressure setting signal indicating a setting steam pressure of said low-pressure side header, a second detection signal of a steam pressure of said low-pressure side header, and the first opening signal indicating the opening of said first bypass valve.