A sensor control device (12) for connection to an oxygen sensor (10) including a sensing element (11) that measures oxygen concentration in an intake atmosphere of an internal combustion engine (40) and a heater (17) that heats the sensing element, including a detection unit (13) that detects an output signal (IP) corresponding to the oxygen concentration output from the sensing element and a calculation unit (15) that calculates a compensation coefficient of the output signal that is used when calculating the oxygen concentration. The calculation unit collects compensation information used in calculating the compensation coefficient when the internal combustion engine is in operation and in a specific operation state in which the oxygen concentration in the intake atmosphere is subject to estimation. Also disclosed is a sensor control system (1) which includes an oxygen sensor (10) and the sensor control device (12).