Monitoring apparatus and monitoring system

A monitoring apparatus comprising:

• a communication interface configured to receive an original image acquired by an omnidirectional camera having an angle of view greater than or equal to 180°;
• and
• a controller configured to control a display to display the original image and at least one calibrated image obtained by dewarping the original image on a screen of a display in a plurality of view modes,
• wherein the view modes comprise a first view mode in which the original image and the calibrated image are displayed on a screen of the display at the same time, and
• wherein, in the original image displayed on the screen, a region of the original image, corresponding to the calibrated image, is visibly divided from the other regions of the original image.