A terminal apparatus and method therefor according to the present invention are an apparatus and method for receiving and displaying monitoring information in an object monitoring system for sensing and monitoring an object, have a plurality of operation modes including a condition check mode of checking a condition of the object until receiving an intention to actually perform an action on the object after receiving the monitoring information, and prohibit executing the condition check mode on the object when a condition of the object is being checked by other apparatus in the condition check mode. The present invention relates to an object monitoring system using the terminal apparatuses, and a central processing apparatus and central processing method therefor.