A tubular insertion device includes a tubular device including a flexible tube portion to be inserted into a subject, a sensor which detects a disposition state of the flexible tube portion in the subject, a prediction calculator which calculates next operation information that is information regarding an operation to be performed next by the tubular device, based on the disposition state detected by the sensor and stored data regarding an operation of the tubular device corresponding to each disposition state of the flexible tube portion, and an output circuit which outputs the next operation information calculated by the prediction calculator.
