Abstract: Disclosed are an automatic position information transmission system and a method using a wireless data network capable of improving convenience of search by registering icons associated with keywords on search screens of corresponding mobile phones and registering icons representing a search position range on the search screens while improving convenience of use by automatically transmitting position information regarding the corresponding mobile phones during a call attempt to a pre-authorized specific mobile phone through a wireless Internet network and automatically transmitting the position information regarding the corresponding mobile phones for each predetermined period or at the time of a call connection failure. The automatic position information transmission system and the method using the wireless data network can automatically transmit the moving routes or positions of children to the mobile phones of a parent as being previously set without performing the separate operations on the mobile phones.

Abstract: Disclosed are a bidirectional information sharing system and a method using a wireless data network that can improve convenience of use by setting notification information regarding specific days which is set to replace sharing information of an unspecified third party that places a call and output the sharing information to output the notification information regarding specified days on the screen when receiving a call of the unspecified third party and input the feelings or inquiries of a user using the mobile phone sharing information of the user to allow the called party to previously know the corresponding contents before a telephone conversation at the time of call connection, and change and set sharing information so as to officially inform only close acquaintances of a relationship status of lovers or the like rather than informing unspecified individuals, in particular, inform or introduce acquaintances of the called party of relationship status.