A mobile terminal, comprising: a display configured to display information; a wireless communication unit configured to transmit and receive information; and a controller configured to: cause the display to display at least one message transmitted to at least one external mobile terminal; cause the display to display an icon (422, 424, 426) corresponding to a selected message of the at least one message in response to a selection of the selected message; cause the wireless communication unit to transmit a check request message in order to request for checking the selected message to a first external mobile terminal selected from the at least one external mobile terminal; search for at least one check request message of a plurality of check request messages that have been transmitted or received up to now based on selected conditions; and cause the display to display at least one message (2140, 2150, 2160) for which a check is requested based on a search result using the selected conditions wherein the transmitted check request message causes the first external mobile terminal to display the selected message at a specific position of a messaging dialog window by automatically scrolling the messaging dialog window to a specific scroll position corresponding to when the selected message was received at the first external mobile terminal, and display text of the selected message with a distinct display effect different from text of other displayed messages of the messaging dialog window. a display configured to display information; a wireless communication unit configured to transmit and receive information; and a controller configured to: cause the display to display at least one message transmitted to at least one external mobile terminal; cause the display to display an icon (422, 424, 426) corresponding to a selected message of the at least one message in response to a selection of the selected message; cause the wireless communication unit to transmit a check request message in order to request for checking the selected message to a first external mobile terminal selected from the at least one external mobile terminal; search for at least one check request message of a plurality of check request messages that have been transmitted or received up to now based on selected conditions; and cause the display to display at least one message (2140, 2150, 2160) for which a check is requested based on a search result using the selected conditions wherein the transmitted check request message causes the first external mobile terminal to display the selected message at a specific position of a messaging dialog window by automatically scrolling the messaging dialog window to a specific scroll position corresponding to when the selected message was received at the first external mobile terminal, and display text of the selected message with a distinct display effect different from text of other displayed messages of the messaging dialog window. cause the display to display at least one message transmitted to at least one external mobile terminal; cause the display to display an icon (422, 424, 426) corresponding to a selected message of the at least one message in response to a selection of the selected message; cause the wireless communication unit to transmit a check request message in order to request for checking the selected message to a first external mobile terminal selected from the at least one external mobile terminal; search for at least one check request message of a plurality of check request messages that have been transmitted or received up to now based on selected conditions; and cause the display to display at least one message (2140, 2150, 2160) for which a check is requested based on a search result using the selected conditions wherein the transmitted check request message causes the first external mobile terminal to display the selected message at a specific position of a messaging dialog window by automatically scrolling the messaging dialog window to a specific scroll position corresponding to when the selected message was received at the first external mobile terminal, and display text of the selected message with a distinct display effect different from text of other displayed messages of the messaging dialog window. display the selected message at a specific position of a messaging dialog window by automatically scrolling the messaging dialog window to a specific scroll position corresponding to when the selected message was received at the first external mobile terminal, and display text of the selected message with a distinct display effect different from text of other displayed messages of the messaging dialog window.