An information processing method executed by a trusted server, wherein the method comprises: receiving a key request message sent by a user terminal; and delivering an encryption key to the user terminal according to the key request message, so that the user terminal transmits encrypted user data to a cloud server after encrypting user data according to the encryption key; acquiring user data of a user terminal, wherein the acquiring user data of a user terminal is specifically: receiving a notification message sent by the user terminal, wherein the notification message is used to notify that encrypted user data has been uploaded to the cloud server by the user terminal, and the encrypted user data is data obtained by the user terminal after encrypting the user data according to a delivered encryption key; sending, to the cloud server according to the notification message, a data request message that is used to request for the encrypted user data; receiving the encrypted user data that is returned by the cloud server according to the data request message; and decrypting the encrypted user data by using the encryption key, to obtain decrypted user data; and the method further comprises: extracting summary information of the user data, wherein the summary information comprises privacy information and non-privacy information of a user, and wherein the summary information refers to a summary of the user data, the privacy information refers to personal sensitive information with a confidential property, and the non-privacy information includes information that interests the user; generating a unique identifier UID for the privacy information; and transmitting the non-privacy information and the UID to the cloud server, so that the cloud server saves a correspondence between the non-privacy information and the UID. receiving a key request message sent by a user terminal; and delivering an encryption key to the user terminal according to the key request message, so that the user terminal transmits encrypted user data to a cloud server after encrypting user data according to the encryption key; acquiring user data of a user terminal, wherein the acquiring user data of a user terminal is specifically: receiving a notification message sent by the user terminal, wherein the notification message is used to notify that encrypted user data has been uploaded to the cloud server by the user terminal, and the encrypted user data is data obtained by the user terminal after encrypting the user data according to a delivered encryption key; sending, to the cloud server according to the notification message, a data request message that is used to request for the encrypted user data; receiving the encrypted user data that is returned by the cloud server according to the data request message; and decrypting the encrypted user data by using the encryption key, to obtain decrypted user data; and the method further comprises: extracting summary information of the user data, wherein the summary information comprises privacy information and non-privacy information of a user, and wherein the summary information refers to a summary of the user data, the privacy information refers to personal sensitive information with a confidential property, and the non-privacy information includes information that interests the user; generating a unique identifier UID for the privacy information; and transmitting the non-privacy information and the UID to the cloud server, so that the cloud server saves a correspondence between the non-privacy information and the UID. receiving a notification message sent by the user terminal, wherein the notification message is used to notify that encrypted user data has been uploaded to the cloud server by the user terminal, and the encrypted user data is data obtained by the user terminal after encrypting the user data according to a delivered encryption key; sending, to the cloud server according to the notification message, a data request message that is used to request for the encrypted user data; receiving the encrypted user data that is returned by the cloud server according to the data request message; and decrypting the encrypted user data by using the encryption key, to obtain decrypted user data; and the method further comprises: extracting summary information of the user data, wherein the summary information comprises privacy information and non-privacy information of a user, and wherein the summary information refers to a summary of the user data, the privacy information refers to personal sensitive information with a confidential property, and the non-privacy information includes information that interests the user; generating a unique identifier UID for the privacy information; and transmitting the non-privacy information and the UID to the cloud server, so that the cloud server saves a correspondence between the non-privacy information and the UID. extracting summary information of the user data, wherein the summary information comprises privacy information and non-privacy information of a user, and wherein the summary information refers to a summary of the user data, the privacy information refers to personal sensitive information with a confidential property, and the non-privacy information includes information that interests the user; generating a unique identifier UID for the privacy information; and transmitting the non-privacy information and the UID to the cloud server, so that the cloud server saves a correspondence between the non-privacy information and the UID.