PROBLEM TO BE SOLVED: To notify a user of surely detecting a fish caught on a fishing hook. ! SOLUTION: A communication terminal device includes: a light emitting means 204; a wireless control part 201 for transmitting information to the other communication terminal device; a triaxial acceleration sensor 205 for detecting an acceleration in a three-dimensional direction; an information processing part 203 for separating the acceleration oriented by setting environment of an own device 104 from the acceleration detected by the triaxial acceleration sensor 205 and determining whether the acceleration after separation being equal to or more than the predetermined value or not; and a system control part 202 for operating the light emitting means 204 as well as notifying the other communication terminal device of the predetermined information via the wireless control part 201 when the acceleration after separation is determined to be equal to or more than the predetermined value by the information processing part 203. ! COPYRIGHT: (C)2013,JPO&INPIT
