Communication system, communication device, server and access method

A communication device, connected to an electronic musical instrument and able to communicate with a server that stores data utilized by the electronic musical instrument, wherein the communication device comprises:

• an authorization information request part, transmitting to the server a request for authorization information for accessing the server together with a device identifier being an identifier set for each of the communication device;
• an authorization information reception part, receiving from the server the authorization information created according to a user corresponding to a user identifier which is corresponding to the device identifier received from the authorization information request part in response to the request transmitted by the authorization information request part, wherein the user identifier is an identifier for each user who uses the communication device corresponding to the device identifier and stored in association with the device identifier in response to the user logging in to the server and registering the device identifier with the server;
• a first data request information reception part, receiving from the electronic musical instrument data request information that requests predetermined data to the server;
• a data request information transmission part, transmitting to the server the data request information received by the first data request information reception part by using the authorization information received by the authorization information reception part;
• a data reception part, receiving from the server data according to the data request information transmitted by the data request information transmission part;
• and
• a first data transmission part, transmitting to the electronic musical instrument the data received by the data reception part.

A server configured to be able to communicate with a communication device, comprising:

• an identifier storage part, storing a device identifier being an identifier set for each of the communication device in association with a user identifier being an identifier for each user who uses the communication device corresponding to the device identifier in response to the user logging in to the server and registering the device identifier with the server;
• an authorization information request reception part, receiving from the communication device a request for authorization information together with the device identifier of the communication device;
• an authorization information creation part, acquiring from the identifier storage part the user identifier corresponding to the device identifier received by the authorization information request reception part, and creating the authorization information according to a user corresponding to the acquired user identifier;
• a first authorization information transmission part, transmitting the authorization information created by the authorization information creation part to the communication device;
• a second data request information reception part, receiving from the communication device data request information that requests predetermined data;
• and
• a second data transmission part, transmitting to the communication device data according to the data request information received by the second data request information reception part.

An access method for accessing data stored on a server from an electronic musical instrument connected to the server, comprising:

• storing on the server a device identifier being an identifier set for each of the electronic musical instrument in association with a user identifier being an identifier for each user who uses the electronic musical instrument corresponding to the device identifier in response to the user logging in to the server and registering the device identifier with the server;
• communicably connecting the electronic musical instrument and the server with each other;
• in the electronic musical instrument, transmitting a request for authorization information for accessing the server to the server together with the device identifier;
• in the server, acquiring from the stored user identifier the user identifier corresponding to the device identifier received from the electronic musical instrument together with the request for the authorization information, and creating the authorization information according to a user corresponding to the acquired user identifier;
• transmitting the created authorization information to the electronic musical instrument;
• in the electronic musical instrument, transmitting data request information that requests predetermined data from the server to the server by using the authorization information requested and received from the server;
• in the server, transmitting data according to the data request information received from the electronic musical instrument to the electronic musical instrument;
• and
• in the electronic musical instrument, receiving from the server the data according to the transmitted data request information.