Navigation system and navigation apparatus

A navigation system comprising a navigation apparatus and an external terminal that remotely controls this navigation apparatus, wherein:

• the navigation apparatus comprises:
• a memory that stores in advance an electronic mail address of the external terminal;
• a navigation module that generates mail;
• and
• a communication control module that switches the navigation module from a sleep mode to a wake-up mode due to an ignition signal of an automobile or an activation signal from the external terminal;
• wherein the navigation module:
• determines whether the wake-up mode is due to the ignition signal or due to the activation signal;
• and
• acquires an IP address of the navigation apparatus when determined as being the wake-up mode is due to the activation signal, generates an electronic mail that contains this acquired IP address, and sends this electronic mail to the external terminal that sent the activation signal by using the electronic mail address of the external terminal.