An information processing device comprising: a first acquirer configured to acquire measured data of a sensor; a second acquirer configured to acquire maintenance information related to maintenance performed on the sensor; a learner configured to learn teacher data in which the acquired maintenance information as label information is associated with the acquired measured data to generate a determination model, the label information including four types of labels indicating no problem, zero-point adjustment being required, sensor cleaning being required, and sensor replacement being required; a storage storing the generated determination model; and a generator configured to generate a maintenance plan for the sensor on the basis of the acquired measured data and the stored determination model, wherein the learner is configured to select whether to set the acquired measured data as teacher data and learn the selected teacher data, and the learner is configured to set as teacher data first measured data and second measured data, the first measured data being acquired in maintenance work for the sensor, the second measured data being acquired during a predetermined period before the measurement date and time of the first measured data, and wherein the information processing device is configured so that, when abnormality is detected at a first date and time and the maintenance work is performed at a second date and time, the label of the maintenance work is associated with measured data between a third date and time, said third date and time being a predetermined time before the first date and time, and the second date and time to generate the teacher data. a first acquirer configured to acquire measured data of a sensor; a second acquirer configured to acquire maintenance information related to maintenance performed on the sensor; a learner configured to learn teacher data in which the acquired maintenance information as label information is associated with the acquired measured data to generate a determination model, the label information including four types of labels indicating no problem, zero-point adjustment being required, sensor cleaning being required, and sensor replacement being required; a storage storing the generated determination model; and a generator configured to generate a maintenance plan for the sensor on the basis of the acquired measured data and the stored determination model, wherein the learner is configured to select whether to set the acquired measured data as teacher data and learn the selected teacher data, and the learner is configured to set as teacher data first measured data and second measured data, the first measured data being acquired in maintenance work for the sensor, the second measured data being acquired during a predetermined period before the measurement date and time of the first measured data, and wherein the information processing device is configured so that, when abnormality is detected at a first date and time and the maintenance work is performed at a second date and time, the label of the maintenance work is associated with measured data between a third date and time, said third date and time being a predetermined time before the first date and time, and the second date and time to generate the teacher data.