| 摘要 |
An object of the present invention is to provide a technique capable of easily managing information whether image data obtained by each of a plurality of cameras can be received by each of a plurality of external monitor means. Image data obtained by a plurality of cameras are transmitted to a server via communication network. When data requesting transmission of the image data obtained by the cameras are sent from the portable telephones to the server, a reception data identifying unit identifies a portable telephone and a camera from device identification data and a camera specifying number in the data requesting the transmission of the image data. When a reception permission determining unit determines that the portable telephone is permitted to receive the image data obtained by the camera on the basis of reception permission information stored in a flash ROM, under control of an overall control unit, desired image data is transmitted from a data output unit to the portable telephone as a transmission request source via a network.
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