An electronic whiteboard control device, connectable to: a touch panel and a display device configured to display information related to writing data by the touch panel the electronic whiteboard control device comprising: an external or built-in storage unit storing the writing data; and a whiteboard rendering processing unit configured to render the writing data acquired by a writing data acquisition processing unit on the display device; characterized in that: the electronic whiteboard control device including: a pass code setting processing unit configured to input and set a storage pass code on created writing data, a writing data storage processing unit configured to store the writing data in the storage unit, wherein the writing data is encrypted with a password based on the storage pass code provided from the pass code setting processing unit, a pass code input processing unit configured to input a restoration pass code which is the same as the storage pass code when writing data stored in the storage unit is used, the writing data acquisition processing unit configured to acquire writing data corresponding to the restoration pass code provided from the pass code input processing unit from the storage unit when the writing data is present in the storage unit, and the whiteboard rendering processing unit; and the writing data storage processing unit is further configured to store a hash value of the storage pass code as a file name used when the writing data is stored in the storage unit, said hash value being a character string which is obtained by irreversible encryption of the storage pass code, and when there is writing data of a file name matching with the hash value of the restoration pass code, the writing data acquisition processing unit acquires the writing data, said hash value being a character string which is obtained by irreversible encryption of the restoration pass code. a touch panel and a display device configured to display information related to writing data by the touch panel the electronic whiteboard control device comprising: an external or built-in storage unit storing the writing data; and a whiteboard rendering processing unit configured to render the writing data acquired by a writing data acquisition processing unit on the display device; characterized in that: an external or built-in storage unit storing the writing data; and a whiteboard rendering processing unit configured to render the writing data acquired by a writing data acquisition processing unit on the display device; characterized in that: the electronic whiteboard control device including: a pass code setting processing unit configured to input and set a storage pass code on created writing data, a writing data storage processing unit configured to store the writing data in the storage unit, wherein the writing data is encrypted with a password based on the storage pass code provided from the pass code setting processing unit, a pass code input processing unit configured to input a restoration pass code which is the same as the storage pass code when writing data stored in the storage unit is used, the writing data acquisition processing unit configured to acquire writing data corresponding to the restoration pass code provided from the pass code input processing unit from the storage unit when the writing data is present in the storage unit, and the whiteboard rendering processing unit; and the writing data storage processing unit is further configured to store a hash value of the storage pass code as a file name used when the writing data is stored in the storage unit, said hash value being a character string which is obtained by irreversible encryption of the storage pass code, and when there is writing data of a file name matching with the hash value of the restoration pass code, the writing data acquisition processing unit acquires the writing data, said hash value being a character string which is obtained by irreversible encryption of the restoration pass code. a pass code setting processing unit configured to input and set a storage pass code on created writing data, a writing data storage processing unit configured to store the writing data in the storage unit, wherein the writing data is encrypted with a password based on the storage pass code provided from the pass code setting processing unit, a pass code input processing unit configured to input a restoration pass code which is the same as the storage pass code when writing data stored in the storage unit is used, the writing data acquisition processing unit configured to acquire writing data corresponding to the restoration pass code provided from the pass code input processing unit from the storage unit when the writing data is present in the storage unit, and the whiteboard rendering processing unit; and the writing data storage processing unit is further configured to store a hash value of the storage pass code as a file name used when the writing data is stored in the storage unit, said hash value being a character string which is obtained by irreversible encryption of the storage pass code, and when there is writing data of a file name matching with the hash value of the restoration pass code, the writing data acquisition processing unit acquires the writing data, said hash value being a character string which is obtained by irreversible encryption of the restoration pass code.