Error informing apparatus and error informing method

摘要

An error detecting section detects an error caused in a mail transmitting section. The error detecting section instructs an error message data generating section to generate an error message data when detecting the error. The error message data includes a character string generated to correspond to the error, and a code. The error message data generating section transmits generated error message data to an ICMP processing section. The ICMP processing section has a function of notifying a communication partner of information using a packet in accordance with a protocol for management, which reports information of a protocol state of IP layer, that is ICMP (Internet Control Message Protocol). The ICMP processing section puts error message data into a Data frame of the packet, and transmits this packet to a predetermined destination via LAN.