An event message transmitting method performed in a controlled device (CD) which is controlled by a control point (CP) is provided, in which an application is received from the CP via a network according to a network protocol, the received application is installed according to a framework of an execution environment of the CD, a first event message that represents a state change of the application is generated according to the framework, and the first event message is converted into a second event message that conforms to the predetermined network protocol. Accordingly, information about a state change of a CD which operates in an execution environment can be adaptively transmitted according to a network protocol.