A content management server comprising: a receiver configured to receive, from a mobile device of a first type adapted to read a content from a recording medium and run the content, a first device identifier identifying the mobile device of the first type and a recording medium identifier identifying a recording medium loaded in the mobile device of the first type, along with a digital signature applied in the mobile device of the first type to the first device identifier and the recording medium identifier using an encryption key secretly stored in the mobile device of the first type; a signature verification unit configured to verify that the recording medium is loaded in the mobile device of the first type by verifying the authenticity of the digital signature, the signature verification unit having a comparison unit; a storage unit configured to store a table that maps the first device identifier to a second device identifier identifying a mobile device of a second type adapted to acquire a content by downloading the content and to run the content accordingly, the table including a field storing a user identifier, being the user name of an account established for access to the server by a user in possession of the mobile device of the first type and the mobile device of the second type; and a voucher issuance unit configured to display a window for user selection of a content from a plurality of contents including a content the same as the content recorded in the recording medium and other content different to the content recorded in the recording medium and to issue, when it is confirmed that the recording medium is loaded in the mobile device of the first type, a voucher to the mobile device of the second type determined as being mapped to the mobile device of the first type by referring to the table, so that the mobile device of the second type is capable of downloading a selected content from the plurality of contents; the voucher issuance unit being configured not to issue the voucher when the digital signature is not verified to be authentic or when it cannot be verified that the user in possession of the mobile device of the first type is also in possession of the mobile device of the second type. a receiver configured to receive, from a mobile device of a first type adapted to read a content from a recording medium and run the content, a first device identifier identifying the mobile device of the first type and a recording medium identifier identifying a recording medium loaded in the mobile device of the first type, along with a digital signature applied in the mobile device of the first type to the first device identifier and the recording medium identifier using an encryption key secretly stored in the mobile device of the first type; a signature verification unit configured to verify that the recording medium is loaded in the mobile device of the first type by verifying the authenticity of the digital signature, the signature verification unit having a comparison unit; a storage unit configured to store a table that maps the first device identifier to a second device identifier identifying a mobile device of a second type adapted to acquire a content by downloading the content and to run the content accordingly, the table including a field storing a user identifier, being the user name of an account established for access to the server by a user in possession of the mobile device of the first type and the mobile device of the second type; and a voucher issuance unit configured to display a window for user selection of a content from a plurality of contents including a content the same as the content recorded in the recording medium and other content different to the content recorded in the recording medium and to issue, when it is confirmed that the recording medium is loaded in the mobile device of the first type, a voucher to the mobile device of the second type determined as being mapped to the mobile device of the first type by referring to the table, so that the mobile device of the second type is capable of downloading a selected content from the plurality of contents; the voucher issuance unit being configured not to issue the voucher when the digital signature is not verified to be authentic or when it cannot be verified that the user in possession of the mobile device of the first type is also in possession of the mobile device of the second type.