An actuator control system comprising: an operation control apparatus comprising a command generation portion that is configured to generate a command signal to control operation of a device driven by an actuator by generating a command signal to operate the device, and an actuator control apparatus that controls the actuator in accordance with the command signal, wherein the actuator control apparatus comprising: a first control portion that is configured to generate a control signal for controlling operation of the actuator in accordance with the command signal, a second control portion that is configured to generate a control signal for controlling an operation of the actuator in accordance with the command signal, wherein the second control portion is different in design from the first control portion, a switching unit (29, 36) that is configured to switch a connection between the actuator and each of the first control portion and the second control portion such that the control signal generated by one of the first control portion and the second control portion is configured to generate a control signal for controlling the operation of the actuator, wherein the operation control apparatus further comprising a first monitoring portion that monitors an operational abnormality of the first control portion and a second monitoring portion that monitors an operational abnormality of the second control portion, and wherein the switching unit (29, 36), is configured to switch between the first and second control portions (25, 26) when an operational abnormality is detected by one of the first monitoring portion and the second monitoring portion, characterized in that: the actuator control apparatus further comprising a third monitoring portion, configured to monitor an operational abnormality of the actuator control apparatus, and wherein said operational abnormality is different in type from an abnormality monitored by the first and the second monitoring portions (22, 23). an operation control apparatus comprising a command generation portion that is configured to generate a command signal to control operation of a device driven by an actuator by generating a command signal to operate the device, and an actuator control apparatus that controls the actuator in accordance with the command signal, wherein the actuator control apparatus comprising: a first control portion that is configured to generate a control signal for controlling operation of the actuator in accordance with the command signal, a second control portion that is configured to generate a control signal for controlling an operation of the actuator in accordance with the command signal, wherein the second control portion is different in design from the first control portion, a switching unit (29, 36) that is configured to switch a connection between the actuator and each of the first control portion and the second control portion such that the control signal generated by one of the first control portion and the second control portion is configured to generate a control signal for controlling the operation of the actuator, wherein the operation control apparatus further comprising a first monitoring portion that monitors an operational abnormality of the first control portion and a second monitoring portion that monitors an operational abnormality of the second control portion, and wherein the switching unit (29, 36), is configured to switch between the first and second control portions (25, 26) when an operational abnormality is detected by one of the first monitoring portion and the second monitoring portion, a first control portion that is configured to generate a control signal for controlling operation of the actuator in accordance with the command signal, a second control portion that is configured to generate a control signal for controlling an operation of the actuator in accordance with the command signal, wherein the second control portion is different in design from the first control portion, a switching unit (29, 36) that is configured to switch a connection between the actuator and each of the first control portion and the second control portion such that the control signal generated by one of the first control portion and the second control portion is configured to generate a control signal for controlling the operation of the actuator, wherein the operation control apparatus further comprising a first monitoring portion that monitors an operational abnormality of the first control portion and a second monitoring portion that monitors an operational abnormality of the second control portion, and wherein the switching unit (29, 36), is configured to switch between the first and second control portions (25, 26) when an operational abnormality is detected by one of the first monitoring portion and the second monitoring portion, characterized in that: the actuator control apparatus further comprising a third monitoring portion, configured to monitor an operational abnormality of the actuator control apparatus, and wherein said operational abnormality is different in type from an abnormality monitored by the first and the second monitoring portions (22, 23).