PROBLEM TO BE SOLVED: To acquire the image data of a desired inspection region by simply and certainly imaging a predetermined inspection region without using a large-scaled device or requiring previous preparation.SOLUTION: An endoscope insertion part 21 having an imaging optical system provided to the leading end part thereof is inserted into the body cavity of a patient and the inspection regions of a plurality of predetermined places are imaged to acquire the still images of the respective inspection regions. To this end, the number of the still images taken at each time when the inspection regions are imaged is counted. Then, the number of the counted still images is compared to the predetermined imaging number corresponding to the number of the inspection regions of a plurality of the predetermined places and, in a case that the imaged number does not coincide with the predetermined imaging number, an alarm is emitted. By this constitution, an imaging error can be reported to an operator.
