An apparatus and a method for megaco protocol conversion is provided. The apparatus includes: a plurality of first protocol execution means for receiving a plurality of different protocol packets, executing operations according to the received protocols, analyzing the received protocols, and generating protocol execution parameters; a megaco protocol execution means for receiving a megaco protocol packet, executing operations according to the received protocol, analyzing the received protocol, and generating protocol execution parameters; databases for storing connection information between the objects and protocol conversion functions; and a protocol conversion means for interworking between the first protocol execution means and the megaco protocol execution means, searching for destination objects and the protocol conversion functions in the database, and converting the generated protocol execution parameters to protocol types of the destination objects, based on condition modes of objects which transmitted the protocol packets.