A rod control and information system for controlling insertion and extraction of a plurality of control rods to and from a nuclear reactor in a nuclear power plant, the system comprising: a control rod position sensor, a control rod integrated controller; control rod on-site transmission devices each including a control rod drive controller and as many control rod individual controllers as the number of the control rods; a motor drive controller; and a brake controller, wherein each control rod individual controller is configured to control insertion and extraction of a plurality of control rods to and from a nuclear reactor in accordance with a control rod drive command, the control rod individual controller further comprises: a first controller configured to transmit a motor drive command to a motor drive controller in the rod control and information system and a brake deactivation command to a brake controller in the rod control and information system in accordance with the control rod drive command transmitted, the first controller is further configured to output a control rod position signal input from the control rod position sensor; and a second controller configured to obtain positions of the control rods through calculation in accordance with the control rod drive command transmitted, the second controller is further configured to output the obtained control rod position as a control rod position signal, wherein the second controller is configured to calculate a change of the control rod position, and configured to calculate the control rod position on the basis of the control rod position information actually input from the control rod position sensor and the calculated change of the control rod position. a control rod position sensor, a control rod integrated controller; control rod on-site transmission devices each including a control rod drive controller and as many control rod individual controllers as the number of the control rods; a motor drive controller; and a brake controller, wherein each control rod individual controller is configured to control insertion and extraction of a plurality of control rods to and from a nuclear reactor in accordance with a control rod drive command, the control rod individual controller further comprises: a first controller configured to transmit a motor drive command to a motor drive controller in the rod control and information system and a brake deactivation command to a brake controller in the rod control and information system in accordance with the control rod drive command transmitted, the first controller is further configured to output a control rod position signal input from the control rod position sensor; and a second controller configured to obtain positions of the control rods through calculation in accordance with the control rod drive command transmitted, the second controller is further configured to output the obtained control rod position as a control rod position signal, wherein the second controller is configured to calculate a change of the control rod position, and configured to calculate the control rod position on the basis of the control rod position information actually input from the control rod position sensor and the calculated change of the control rod position. a first controller configured to transmit a motor drive command to a motor drive controller in the rod control and information system and a brake deactivation command to a brake controller in the rod control and information system in accordance with the control rod drive command transmitted, the first controller is further configured to output a control rod position signal input from the control rod position sensor; and a second controller configured to obtain positions of the control rods through calculation in accordance with the control rod drive command transmitted, the second controller is further configured to output the obtained control rod position as a control rod position signal, wherein the second controller is configured to calculate a change of the control rod position, and configured to calculate the control rod position on the basis of the control rod position information actually input from the control rod position sensor and the calculated change of the control rod position.