A system and method transmitting and receiving condition information which changes from time to time from terminals connected to a network, monitoring the reliability of the condition information and displaying a display mode of the condition information depending on the reliability of the condition information comprising a freshness determination unit calculating freshness of the condition information from a difference between a time a terminal receives the condition information from other terminals through the network and a time the condition information is referenced by other terminals through the network and a display controlling unit determining depending on the freshness information determined by the freshness determination unit the display mode of the condition information, wherein the display unit displays the display mode of the condition information.