To provide the image data receiver that can reconnect to a network automatically, with respect to a prescribed image data supply section, on the occurrence of an event such as stop of supply of image data or an undesired end of connection to the network.

In the case that a 1st discrimination section 27 of the image data receiver 71 discriminates that a state of not receiving a moving image from an object monitor section connecting to itself through a network is consecutive for a prescribed time or longer, the connection is once released, and a connection processing section 23 connects again automatically to the object monitor section being a connection object, based on connection data stored in a storage section 31. In the case that a 2nd discrimination section 29 discriminates that the connection to the object monitor section is undesirably released without autonomous connection release by the connection processing section, the connection processing section 23 again connects to the object monitor section being the connection object automatically, based on the connection data of the storage section 31.