Abstract: A method of transmitting and receiving an audio/video data, and a method of communication between a first mobile communication apparatus and a second mobile communication apparatus using audio/video data are provided. An audio/video data to be transmitted is selected via the first mobile communication apparatus. Next, the audio/video data is transformed into at least one data packet via the first mobile communication apparatus based on a permitted data flow specified by PHS. Next, the packet data is transmitted via the first communication apparatus. Thereafter, the data packet is received via the second mobile communication apparatus where the data packet is transformed into the audio/video data.

Abstract: A method for sharing a single general packet radio service (GPRS) card over a LAN. First, registration information is transmitted from one or more clients to a server which comprises a GPRS card, and the server checks whether each of the clients has usage authorization. Next, the server stores the registration information transmitted from authorized clients and transmits successful registration information thereto. Finally, accepted clients can perform wireless communication by the GPRS card.