A portable device can transmit information through one of a mobile phone network and an Internet, wherein the portable device includes a text-based communication module to allow a user may synchronously transmit or receive data through a local area network, wherein the data is text, audio, video or the combination thereof. The text-based communication module of the portable device includes a message deletion module used to facilitate withdrawing a transmitted message, a target re-direct module for re-directing a message target, and a message transmission setting module for setting a transmission time interval of a message transmitted to a target terminal.