An apparatus, system and method for executing discovery in a network are provided. The system for executing discovery in a network is configured with a SyncML server and a SyncML client, and includes a SyncML server that transmits a multicast search message to the SyncML client in order to search for a SyncML client that exists in a network, and executes a data synchronization with the found SyncML client, and a SyncML client that transmits a notify-alive message to the SyncML server in order to notify that the SyncML client exists in a network, and executes a synchronization with the SyncML server.