Apparatus and method for multi-tasking in mobile terminal having multimedia processor for video-on-demand (VOD) services that identifies port of each data received during use of VOD service and processes data to enable user to implement any other network application program simultaneously with use of VOD service. Method provided includes setting port number for VOD services of multimedia processor and accessing VOD server when demand for VOD services is received, processing VOD data received through the set port number to deploy VOD services, determining whether port number of data received during VOD services is identical to the set port number. When the port number of the received data is identical to the set port number, recognizing received data as VOD data to deploy VOD services, when not, recognizing received data as general data and sending it to MSM from the multimedia processor, and processing general data sent to the MSM.