To enable a sender of message to easily confirm an operation to be performed by a device received with the message on the basis of the message.
A cellular telephone 100-1 transmits a message including a character string to a server device 600. The server device 600 stores a character string to be a retrieval key and explanation data that explains an operation that an electronic pet 200 performs on the basis of a key character string. When the server device 600 receives the message including the character string, the server device 600 compares the character string included in the received message with the key character string, specifies the explanation data on the basis of coincided character strings and transmits the specified explanation data to the cellular telephone set 100-1.
ARAKI YOSHIHIKO
HONDA KUMIKO
YAMAZAKI KOREKA
Takashi Matsumoto