Patent ID: 8213969

Claim:
A mobile communication terminal that supports a text chatting service providing a chatting function by using a short message service, the mobile communication terminal comprising: a program memory configured to store a text chatting program for the test chatting service and a program configured to perform additional functions executed in the text chatting service; a data storage unit configured to store a text chatting message that is transferred through the text chatting service; a key input unit including a key button for generating the text chatting message; a display configured to display the text chatting message in a chatting window; and a microprocessor configured to execute the text chatting program and perform a control function to display text chatting messages communicated with a mobile communication terminal of a chatting contact in the chatting window, the text chatting message transferred by using the short message service, wherein the text chatting messages communicated with the mobile communication terminal of the chatting contact and an input chatting message to be transferred to the chatting contact that is input by a user are displayed together in the chatting window, wherein the mobile communication terminal terminates a text chatting mode for the text chatting service, stores the text chatting message transferred through the text chatting service in the data storage unit, wherein the mobile communication determines whether a received text chatting message is received within a predetermined time period, sets the mobile communication terminal to the text chatting mode and displays the text chatting message stored in the data storage unit on the display when the received text chatting message is received within the predetermined time period.