Communication terminal and communication system

A communication terminal comprising:

• a first communication unit that performs communication including establishing at least a voice call with a remote communication terminal that is located remotely from the first communication unit;
• an operation input unit that acquires input from a user;
• a second communication unit that performs communication with an electronic device, connected to a local area network, that implements a function that is controlled when the electronic device is accessed via at least an external network to which the remote communication terminal is connected;
• and
• a control unit that, when an access permission instruction is inputted by the user via said operation input unit during a time period in which the voice call is in a connected state, performs, during the time period, setting with respect to the electronic device to permit the remote communication terminal and said first communication unit to access the electronic device, at least one of said remote communication terminal and said first communication unit accessing the electronic device via the external network, and transmits, during the time period, to the remote communication terminal via the first communication unit, access information for performing the access to the electronic device, via the external network, wherein said control unit performs setting with respect to the electronic device to prohibit the access via said external network, when the voice call is disconnected, and wherein said control unit, when performing the setting with respect to the remote communication terminal to permit the access via said external network, requests authentication key information for temporarily permitting the access via said external network from said the remote communication terminal, and causes the authentication key information acquired from the electronic device to be included in said access information.