Abstract: A main controller used in a security system having a sensor or a camera performs wireless communication with the sensor or the camera so as to control the sensor or the camera. The main controller has a plurality of communication sections that perform wireless communication by using communication systems having different communication speeds. The camera transmits and receives information by performing wireless communication with the main controller. The camera is provided with a first camera communication section and a second camera communication section that perform wireless communication by using communication systems having different communication speeds, and a camera communication control section for selecting the first camera communication section and the second camera communication section according to the information to be transmitted and received, as a communication section to perform communication.

Abstract: A protocol converting apparatus (communication relay apparatus) relays communications between a cellular phone and an specific network (VPN) so that the cellular phone is connected to the VPN in which communication is performed by using an independently set dedicated address. The protocol converting apparatus has a data communication section that performs data communication with the cellular phone, a VPN connecting section that performs data communication with the specific network (VPN), a protocol converting section that converts a communication protocol of communication data, and an address authentication specifying section that specifies a destination of the communication data.

Abstract: A main controller used in a security system having a sensor or a camera performs wireless communication with the sensor or the camera so as to control the sensor or the camera. The main controller has a plurality of communication sections that perform wireless communication by using communication systems having different communication speeds. The camera transmits and receives information by performing wireless communication with the main controller. The camera is provided with a first camera communication section and a second camera communication section that perform wireless communication by using communication systems having different communication speeds, and a camera communication control section for selecting the first camera communication section and the second camera communication section according to the information to be transmitted and received, as a communication section to perform communication.

Abstract: The subject invention provides an information delivery system which performs information reproduction according to reproduction circumstances, such as available communication modes for the information reproduction device, user's request etc., thereby carrying out information delivery in the most appropriate way to the user. For example, the center system (3) determines the level of attribute information of the target information, which is information item that the user of vehicle (2) wishes to obtain through communication with the center system (3). According to this determination, the center system (3) selects one of DSRC communication using a DSRC terminal device (1) and a DSRC radio device (4), or a mobile phone (5) as means for transmission of target information.