Provided are an apparatus of processing a dialog based message object and a method thereof, in which the apparatus of processing a dialog based message object and the method thereof include a memory and a processor electrically connected to the memory. The processor creates a dialog in which at least one user participates, provides the dialog with a message thread including an existing message object spontaneously created by the at least one user, receives an unspecified or specified message object from one of the at least one user and additionally inserts the received unspecified or specified message object into the message thread, detects whether a corresponding specified user reads the specified message object in the message thread to count the number of unread specified message objects, and provides the corresponding specified user with the number of unread specified message objects.