A posted message providing system, characterized by: a posted message information obtaining unit that obtains a message posted on a computer network, hereafter "posted message", said posted message including at least text, a posting time of said message, a user ID and posting location information representing the location of the poster of said posted message at said posting time; a poster location history obtaining unit that obtains a poster location history specifying the location of said poster up until a predetermined time before said posting time as a history of a specific result in which a location of said poster is specified at predetermined time intervals; a memory unit that stores map information; a location information correcting unit that corrects said posting location information to a location specified by said location information correcting unit, hereafter "corrected location information" by using said poster location history, based on said text of said posted message, to correct any mismatch between said text and said posting location information; and a providing unit configured to provide said posted message based on said corrected location information, wherein: when said text of said posted message contains a word relating to a traffic condition, said corrected location information specifies a location where the poster encountered said traffic condition, said location being a location where the travel speed of said poster calculated from distance intervals of said poster location history is less than a predetermined threshold. a posted message information obtaining unit that obtains a message posted on a computer network, hereafter "posted message", said posted message including at least text, a posting time of said message, a user ID and posting location information representing the location of the poster of said posted message at said posting time; a poster location history obtaining unit that obtains a poster location history specifying the location of said poster up until a predetermined time before said posting time as a history of a specific result in which a location of said poster is specified at predetermined time intervals; a memory unit that stores map information; a location information correcting unit that corrects said posting location information to a location specified by said location information correcting unit, hereafter "corrected location information" by using said poster location history, based on said text of said posted message, to correct any mismatch between said text and said posting location information; and a providing unit configured to provide said posted message based on said corrected location information, wherein: when said text of said posted message contains a word relating to a traffic condition, said corrected location information specifies a location where the poster encountered said traffic condition, said location being a location where the travel speed of said poster calculated from distance intervals of said poster location history is less than a predetermined threshold. when said text of said posted message contains a word relating to a traffic condition, said corrected location information specifies a location where the poster encountered said traffic condition, said location being a location where the travel speed of said poster calculated from distance intervals of said poster location history is less than a predetermined threshold.