Patent Publication Number: US-2015074142-A1

Title: Method and Apparatus for Expanding Storage Space

Description:
This application is a continuation of International Application No. PCT/CN2012/083379, filed on Oct. 23, 2012, which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for expanding a storage space. 
     BACKGROUND 
     With the rapid development of various types of terminals, a bluetooth technology has almost already become a standard function of each terminal, and is mainly used for a short-distance data transmission service, such as, used for file transmission between terminals. One terminal sends a file, the other terminal receives the file, and for the opposite party, the two terminals are each a black box, and are invisible. 
     During a process of data transmission through the bluetooth technology, the inventor finds that the prior art has at least the following problem: When a first terminal sends a file to a second terminal through bluetooth, a storage space of the second terminal is invisible to the first terminal, which is inconvenient for file storage. 
     SUMMARY 
     Embodiments of the present invention provide a method and an apparatus for expanding a storage space, which implement that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     To achieve the foregoing objective, the embodiments of the present invention adopt the following technical solutions: 
     In a first aspect, the present invention provides a method for expanding a storage space, where the method includes sending, by a first terminal, a first instruction message to a second terminal. The first instruction message carries an instruction of obtaining information of a storage space of the second terminal. A first instruction response message sent by the second terminal is received by the first terminal. The first instruction response message carries the information of the storage space of the second terminal. The method further includes setting, by the first terminal, a virtual folder in a storage space of the first terminal, and storing, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. 
     In a first possible implementation manner of the first aspect, the method further includes sending, by the first terminal, a second instruction message to the second terminal when receiving an operation that a user stores a first designated file in the virtual folder of the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file. The method further includes sending, by the first terminal, the first designated file to the second terminal when the first terminal receives a confirmation instruction sent by the second terminal. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. The method further includes storing, by the first terminal, a file name of the first designated file in the virtual folder of the first terminal according to the designated storage path when the first terminal receives a second instruction response message sent by the second terminal. The second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the first aspect, after the sending, by the first terminal, a second instruction message to the second terminal when receiving an operation that a user stores a first designated file in the virtual folder of the first terminal, the method further includes prompting, by the first terminal, that the first designated file cannot be stored in the virtual folder when the first terminal receives an error instruction sent by the second terminal. The error instruction indicates that a residual storage space of the second terminal is less than the size of the first designated file. 
     In a third possible implementation manner of the first aspect, the method further includes sending, by the first terminal, a third instruction message to the second terminal when receiving an operation that a user invokes a second designated file in the virtual folder of the first terminal. The third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The method further includes receiving, by the first terminal, a third instruction response message and a duplicate of the second designated file that are sent by the second terminal. The third instruction response message carries an instruction that file invocation is successful. The method further includes storing, by the first terminal, the duplicate of the second designated file in the storage space of the first terminal, so that the user performs a read/write operation on the duplicate of the second designated file. 
     In a fourth possible implementation manner of the first aspect, the method further includes sending, by the first terminal, a fourth instruction message to the second terminal when receiving an operation that a user deletes a third designated file in the virtual folder of the first terminal. The fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The method further includes deleting, by the first terminal, the file name of the third designated file from the virtual folder according to the deletion path when the first terminal receives a fourth instruction response message sent by the second terminal. The fourth instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the first aspect, the method further includes sending, by the first terminal, a fifth instruction message to the second terminal when receiving an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal. The fifth instruction message carries an instruction of querying a residual storage space of the second terminal. The method further includes receiving, by the first terminal, a fifth instruction response message sent by the second terminal, where the fifth instruction response message carries a size of the residual storage space of the second terminal. The method further includes displaying, by the first terminal, the size of the residual storage space of the virtual folder, where the size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     In a second aspect, the present invention provides a method for expanding a storage space, where the method includes obtaining information of a storage space of a second terminal when the second terminal receives a first instruction message sent by a first terminal. The first instruction message carries an instruction of obtaining the information of the storage space of the second terminal. The method further includes sending, by the second terminal, a first instruction response message to the first terminal. The first instruction response message carries the information of the storage space of the second terminal. 
     In a first possible implementation manner of the second aspect, the method further includes determining, by the second terminal, whether a size of a residual storage space of the second terminal is less than a size of a to-be-stored first designated file when the second terminal receives a second instruction message sent by the first terminal. 
     The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the first designated file. The method further includes sending, by the second terminal, a confirmation instruction to the first terminal when the size of the residual storage space of the second terminal is not less than the size of the first designated file. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. The method further includes receiving, by the second terminal, the first designated file sent by the first terminal, and storing the first designated file in the storage space of the second terminal according to the designated storage path. The method further includes sending, by the second terminal, a second instruction response message to the first terminal. The second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the second aspect, the method further includes sending, by the second terminal, an error instruction to the first terminal when the size of the residual storage space of the second terminal is less than the size of the first designated file. The error instruction indicates that the residual storage space of the second terminal is less than the size of the first designated file. 
     In a third possible implementation manner of the second aspect, the method further includes receiving, by the second terminal, a third instruction message sent by the first terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of a second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The method further includes searching, by the second terminal, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. When finding, through searching, a file with a file name the same as the file name of the second designated file, duplicating, by the second terminal, the second designated file, to obtain a duplicate of the second designated file. The method further includes sending, by the second terminal, a third instruction response message and the duplicate of the second designated file to the first terminal. The third instruction response message carries an instruction that file invocation is successful. 
     In a fourth possible implementation manner of the second aspect, the method further includes receiving, by the second terminal, a fourth instruction message sent by the first terminal, where the fourth instruction message carries an instruction of deleting a third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The method further includes searching, by the second terminal, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. When finding, through searching, a file with a file name the same as the file name of the third designated file, deleting, by the second terminal, the file, and sending a fourth instruction response message to the first terminal, where the fourth instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the second aspect, the method further includes querying, by the second terminal, a size of a residual storage space of the second terminal when the second terminal receives a fifth instruction message sent by the first terminal. The fifth instruction message carries an instruction of querying the residual storage space of the second terminal. The method further includes sending, by the second terminal, a fifth instruction response message to the first terminal. The fifth instruction response message carries the size of the residual storage space of the second terminal. 
     In a third aspect, the present invention provides an apparatus for expanding a storage space. The apparatus includes a sending unit, configured to send a first instruction message to a second terminal. The first instruction message carries an instruction of obtaining information of a storage space of the second terminal. A receiving unit is configured to, after the sending unit sends the first instruction message to the second terminal, receive a first instruction response message sent by the second terminal, where the first instruction response message carries the information of the storage space of the second terminal. A processing unit is configured to set a virtual folder in a storage space of the first terminal, and store, in the virtual folder. The information of the storage space of the second terminal is carried in the first instruction response message received by the receiving unit. 
     In a first possible implementation manner of the third aspect, the apparatus further includes the sending unit is further configured to, when the receiving unit receives an operation that a user stores a first designated file in the virtual folder of the first terminal, send a second instruction message to the second terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file; and when the receiving unit receives a confirmation instruction sent by the second terminal, send the first designated file to the second terminal, where the confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. The processing unit is further configured to, when the receiving unit receives a second instruction response message sent by the second terminal, store a file name of the first designated file in the virtual folder of the first terminal according to the designated storage path, where the second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the third aspect, the apparatus further includes a prompting unit configured to, when the receiving unit receives an error instruction sent by the second terminal, prompt that the first designated file cannot be stored in the virtual folder, where the error instruction indicates that a residual storage space of the second terminal is less than the size of the first designated file. 
     In a third possible implementation manner of the third aspect, the apparatus further includes the sending unit, further configured to, when the receiving unit receives an operation that a user invokes a second designated file in the virtual folder of the first terminal, send a third instruction message to the second terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The receiving unit is further configured to receive a third instruction response message and a duplicate of the second designated file that are sent by the second terminal, where the third instruction response message carries an instruction that file invocation is successful. The processing unit is further configured to store, in the storage space of the first terminal, the duplicate which is of the second designated file and is received by the receiving unit, so that the user performs a read/write operation on the duplicate of the second designated file. 
     In a fourth possible implementation manner of the third aspect, the apparatus further includes the sending unit further configured to, when the receiving unit receives an operation that a user deletes a third designated file in the virtual folder of the first terminal, send a fourth instruction message to the second terminal, where the fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The processing unit, further configured to, when the receiving unit receives a fourth instruction response message sent by the second terminal, delete the file name of the third designated file from the virtual folder according to the deletion path, where the second instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the third aspect, the apparatus further includes the sending unit further configured to, when the receiving unit receives an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal, send a fifth instruction message to the second terminal, where the fifth instruction message carries an instruction of querying a residual storage space of the second terminal. The receiving unit, further configured to receive a fifth instruction response message sent by the second terminal, where the fifth instruction response message carries a size of the residual storage space of the second terminal. The prompting unit is further configured to display the size of the residual storage space of the virtual folder according to the fifth instruction response message received by the receiving unit. The size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     In combination with any one of the first possible implementation manner to the fifth possible implementation manner of the third aspect, the apparatus is disposed in a client of the first terminal, or the apparatus is a client of the first terminal. 
     In a fourth aspect, the present invention provides an apparatus for expanding a storage space, where the apparatus includes a receiving unit configured to receive a first instruction message sent by a first terminal. The first instruction message carries an instruction of obtaining information of a storage space of a second terminal. An obtaining unit is configured to, when the receiving unit receives the first instruction message sent by the first terminal, obtain the information of the storage space of the second terminal. A sending unit is configured to, send a first instruction response message to the first terminal according to the information of the storage space of the second terminal obtained by the obtaining unit, where the first instruction response message carries the information of the storage space of the second terminal. 
     In a first possible implementation manner of the fourth aspect, the apparatus further includes a processing unit, configured to, when the receiving unit receives a second instruction message sent by the first terminal, determine whether a size of a residual storage space of the second terminal is less than a size of a to-be-stored first designated file, where the second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and the size of the first designated file. The sending unit is further configured to, when the processing unit obtains that the size of the residual storage space of the second terminal is not less than the size of the first designated file, send a confirmation instruction to the first terminal, where the confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. A storage unit is configured to store, according to the designated storage path, in the storage space of the second terminal, the first designated file sent by the first terminal and received by the receiving unit. The sending unit is further configured to send a second instruction response message to the first terminal, where the second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the fourth aspect, the sending unit is further configured to, when the processing unit obtains that the size of the residual storage space of the second terminal is less than the size of the first designated file, send an error instruction to the first terminal, where the error instruction indicates that the residual storage space of the second terminal is less than the size of the first designated file. 
     In a third possible implementation manner of the fourth aspect, the receiving unit is further configured to receive a third instruction message sent by the first terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of a second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The apparatus further includes a searching unit, configured to search, by using the file name which is of the second designated file and is received by the receiving unit, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. The processing unit is further configured to, when the searching unit finds, through searching, a file with a file name the same as the file name of the second designated file, duplicate the second designated file, to obtain a duplicate of the second designated file. The sending unit is further configured to send a third instruction response message and the duplicate of the second designated file to the first terminal, where the third instruction response message carries an instruction that file invocation is successful. 
     In a fourth possible implementation manner of the fourth aspect, the receiving unit is further configured to receive a fourth instruction message sent by the first terminal, where the fourth instruction message carries an instruction of deleting a third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The searching unit is further configured to, when the receiving unit receives the fourth instruction message, search, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. The processing unit is further configured to, when the searching unit finds, through searching, a file with a file name the same as the file name of the third designated file, delete the file, and send a fourth instruction response message to the first terminal by using the sending unit, where the fourth instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the fourth aspect, the apparatus further includes a querying unit, configured to, when the receiving unit receives a fifth instruction message sent by the first terminal, query a size of a residual storage space of the second terminal, where the fifth instruction message carries an instruction of querying the residual storage space of the second terminal. The sending unit is further configured to send, according to a result obtained, through querying, by the querying unit, a fifth instruction response message to the first terminal, where the fifth instruction response message carries the size of the residual storage space of the second terminal. 
     In combination with any one of the first possible implementation manner to the fifth possible implementation manner of the fourth aspect, the apparatus is disposed in a client of the second terminal, or the apparatus is a client of the second terminal. 
     In a fifth aspect, the present invention provides an apparatus for expanding a storage space, where the apparatus includes a memory, configured to store a software program and data, a wireless communication module, configured to receive/send an instruction message and a file, and send an instruction message or a file sent by a second terminal to a processor for processing; and additionally, send an instruction message processed by the processor to the second terminal. The processor is configured to execute the software program in the memory, and specifically execute sending a first instruction message to the second terminal. The first instruction message carries an instruction of obtaining information of a storage space of the second terminal. A first instruction response message sent by the second terminal is received. The first instruction response message carries the information of the storage space of the second terminal. The executing instruction set a virtual folder in a memory of a first terminal, and store, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. 
     In a first possible implementation manner of the fifth aspect, the processor is further configured to execute sending a second instruction message to the second terminal when receiving an operation that a user stores a first designated file in the virtual folder of the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file. The first designated file is sent to the second terminal when receiving a confirmation instruction sent by the second terminal. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. A file name of the first designated file is stored in the virtual folder of the first terminal according to the designated storage path when receiving a second instruction response message sent by the second terminal. The second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the fifth aspect, the processor is further configured to execute when receiving an error instruction sent by the second terminal, prompting that the first designated file cannot be stored in the virtual folder, where the error instruction indicates that a residual storage space of the second terminal is less than the size of the first designated file. The apparatus further includes a display; and the display prompts that the first designated file cannot be stored in the virtual folder. 
     In a third possible implementation manner of the fifth aspect, the processor is further configured to execute the steps of sending a third instruction message to the second terminal when receiving an operation that a user invokes a second designated file in the virtual folder of the first terminal. The third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The processor is further configured to execute the steps of receiving a third instruction response message and a duplicate of the second designated file that are sent by the second terminal. The third instruction response message carries an instruction that file invocation is successful. The processor is further configured to execute storing the duplicate of the second designated file in a storage space of the first terminal, so that the user performs a read/write operation on the duplicate of the second designated file. 
     In a fourth possible implementation manner of the fifth aspect, the processor is further configured to execute sending a fourth instruction message to the second terminal when receiving an operation that a user deletes a third designated file in the virtual folder of the first terminal. The fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The processor is further configured to execute the steps of deleting the file name of the third designated file from the virtual folder according to the deletion path when receiving a fourth instruction response message sent by the second terminal, where the second instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the fifth aspect, the processor is further configured to execute sending a fifth instruction message to the second terminal when receiving an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal. The fifth instruction message carries an instruction of querying a residual storage space of the second terminal. The processor is further configured to execute the steps of receiving a fifth instruction response message sent by the second terminal. The fifth instruction response message carries a size of the residual storage space of the second terminal. The processor is further configured to execute displaying the size of the residual storage space of the virtual folder. The size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     In combination with any one of the first possible implementation manner to the fifth possible implementation manner of the fifth aspect, the apparatus is disposed in a client of the first terminal, or the apparatus is a client of the first terminal. 
     In a sixth aspect, the present invention provides an apparatus for expanding a storage space, where the apparatus includes a memory configured to store a software program and data, and a wireless communication module configured to receive/send an instruction message and a file, and send an instruction message or a file sent by a first terminal to a processor for processing; and additionally, send an instruction message processed by the processor to the first terminal. The processor is configured to execute the software program in the memory, and specifically execute obtaining information of a storage space of a second terminal when receiving a first instruction message sent by the first terminal. The first instruction message carries an instruction of obtaining the information of the storage space of the second terminal. The processor is configured to execute the software program in the memory, and specifically execute sending a first instruction response message to the first terminal, where the first instruction response message carries the information of the storage space of the second terminal. 
     In a first possible implementation manner of the sixth aspect, the processor is further configured to execute determining whether a size of a residual storage space of the second terminal is less than a size of a to-be-stored first designated file when receiving a second instruction message sent by the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and the size of the first designated file. The processor is further configured to execute sending a confirmation instruction to the first terminal when the size of the residual storage space of the second terminal is not less than the size of the first designated file. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. The processor is further configured to execute receiving the first designated file sent by the first terminal, and storing the first designated file in the storage space of the second terminal according to the designated storage path. The processor is further configured to execute sending a second instruction response message to the first terminal, where the second instruction response message carries an instruction that file storage is successful. 
     In a second possible implementation manner of the sixth aspect, the processor is further configured to execute sending, by the second terminal, an error instruction to the first terminal when a size of a residual storage space of the memory is less than the size of the first designated file. The error instruction indicates that the residual storage space of the memory is less than the size of the first designated file. 
     In a third possible implementation manner of the sixth aspect, the processor is further configured to execute receiving a third instruction message sent by the first terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of a second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The processor is further configured to execute searching, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. The processor is further configured to execute when finding, through searching, a file with a file name the same as the file name of the second designated file, duplicating the second designated file, to obtain a duplicate of the second designated file. The processor is further configured to execute sending a third instruction response message and the duplicate of the second designated file to the first terminal. The third instruction response message carries an instruction that file invocation is successful. 
     In a fourth possible implementation manner of the sixth aspect, the processor is further configured to execute receiving a fourth instruction message sent by the first terminal. The fourth instruction message carries an instruction of deleting a third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The processor is further configured to execute searching, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. The processor is further configured to execute when finding, through searching, a file with a file name the same as the file name of the third designated file, deleting the file, and sending a fourth instruction response message to the first terminal. The fourth instruction response message carries an instruction that file deletion is successful. 
     In a fifth possible implementation manner of the sixth aspect, the processor is further configured to execute querying a size of a residual storage space of the memory when receiving a fifth instruction message sent by the first terminal. The fifth instruction message carries an instruction of querying the residual storage space of the memory. The processor is further configured to execute sending a fifth instruction response message to the first terminal, where the fifth instruction response message carries the size of the residual storage space of the memory. 
     In combination with any one of the first possible implementation manner to the fifth possible implementation manner of the sixth aspect, the apparatus is disposed in a client of the second terminal, or the apparatus is a client of the second terminal. 
     In the method and the apparatus for expanding a storage space provided by the embodiments of the present invention, a first terminal sends a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal; and after receiving a first instruction response message sent by the second terminal, sets a virtual folder in a storage space of the first terminal, and stores, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. In the embodiments of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       To describe the technical solutions in the embodiments of the present invention more clearly, accompanying drawings for describing the embodiments of the present invention are briefly introduced in the following. Apparently, the accompanying drawings in the following description are only some embodiments of the present invention, and persons of ordinary skill in the art may further obtain other drawings according to these accompanying drawings without creative efforts. 
         FIG. 1  is a flow chart of a method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 2  is a flow chart of another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 3  is a flow chart of still another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 4  is a flow chart of yet another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 5  is a flow chart of yet another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 6  is a flow chart of yet another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 7  is a flow chart of yet another method for expanding a storage space according to Embodiment 1 of the present invention; 
         FIG. 8  is a structural diagram of an apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 9  is a structural diagram of another apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 10  is a structural diagram of still another apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 11  is a structural diagram of yet another apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 12  is a structural diagram of yet another apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 13  is a structural diagram of yet another apparatus for expanding a storage space according to Embodiment 2 of the present invention; 
         FIG. 14  is a structural diagram of an apparatus for expanding a storage space according to Embodiment 3 of the present invention; 
         FIG. 15  is a structural diagram of another apparatus for expanding a storage space according to Embodiment 3 of the present invention; and 
         FIG. 16  is a structural diagram of still another apparatus for expanding a storage space according to Embodiment 3 of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     A method and an apparatus for expanding a storage space according to the embodiments of the present invention are described in detail in the following with reference to the accompanying drawings. 
     A first terminal and a second terminal in the embodiments of the present invention both are a mobile phone or another mobile terminal using an Android (android) system, and the two terminals perform instruction interaction in specific clients of the two terminals. 
     Embodiment 1 
     The embodiment of the present invention provides a method for expanding a storage space, and as shown in  FIG. 1 , the method includes the following steps. 
       101 : A first terminal sends a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal. 
     A manner of message transmission between the first terminal and the second terminal is not limited here, and may also be WiFi or other manners besides bluetooth. Description is given by taking that the first terminal and the second terminal establish a bluetooth connection as an example. After the first terminal and the second terminal establish the bluetooth connection, a user may choose to enable, on a client of the first terminal, a function of expanding the storage space of the second terminal into a storage space of the first terminal; or while the first terminal and the second terminal establish a bluetooth connection, the first terminal automatically enables the function, and similar means are all acceptable, and are not limited here. 
     As long as it is ensured that a defined first instruction message can be distinguished from a general bluetooth transmission file, a format of the first instruction message may be defined randomly, and the first instruction message is parsable to the first terminal and the second terminal. For example, the first instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt, which indicates that the first terminal performs a relevant operation on the storage space of the second terminal. The second terminal determines, by parsing a received file, what specific operation it is. 
     The instruction in the first instruction message may be indicated by using hexadecimal, and a format is 00 01 02 03 02 A6 10 0D 0A, where “00 01 02 03 02 A6” is a prefix of the first instruction message, “10” indicates the instruction of obtaining the information of the storage space of the second terminal, and “0D 0A” is a suffix of the first instruction message, and indicates that the instruction message is ended. 
       102 : The first terminal receives a first instruction response message sent by the second terminal, where the first instruction response message carries the information of the storage space of the second terminal. 
     As long as it is ensured that a defined first instruction response message can be distinguished from a general bluetooth transmission file, a format of the first instruction response message may be defined randomly, and the first instruction response message is parsable to the first terminal and the second terminal. For example, the first instruction response message is encapsulated in a form of .txt file for transmission. 
     When the first terminal receives a file with a file name of handset B to handset A.txt, it indicates that the second terminal responds to the file with a same file name sent by the first terminal. An instruction in the first instruction response message may be indicated by using hexadecimal. When the storage space of the second terminal stores two files, whose file names are one.txt and two.txt respectively, the first instruction response message includes two instructions, and formats of the two instructions are respectively shown in the following: 
     A format of a first instruction carrying a file name of one.txt is 00 01 02 03 02 A6 11 08 00 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the first instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the first instruction message carries the information of the storage space of the second terminal, “08” is used to indicate that the number of effective bytes of the file name of the file one.txt stored in the storage space of the second terminal is 8, namely, an 8-byte ASCII code after “08” indicates the file name of the file, “00 6F 6E 65 2E 74 78 74” indicates that the file name is “one.txt”, and “0D 0A” is a suffix of the first instruction, and indicates that the first instruction is ended. 
     A format of a second instruction carrying a file name of two.txt is 00 01 02 03 02 A6 11 08 00 74 77 6F 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the second instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the file is used to carry the information of the storage space of the second terminal, “08” is used to indicate that the number of effective bytes of the file name of the file two.txt stored in the storage space of the second terminal is 8, namely, an 8-byte ASCII code after “08” indicates the file name of the file, “00 74 77 6F 2E 74 78 74” indicates that the file name is “two.txt”, and “0D 0A” is a suffix of the second instruction, and indicates that the second instruction is ended. 
     For the foregoing one.txt and two.txt, the first instruction response message may also carry storage paths of the two files, such as ./one.txt, and ./two.txt, which indicate that these two files are stored under a root directory of the storage space of the second terminal, and formats of the two instructions included in the first instruction response message are respectively shown in the following: 
     A format of the first instruction that carries a storage path ./one.txt of a file name one.txt is 00 01 02 03 02 A6 11 10 00 2E 2F 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the first instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the first instruction message carries the information of the storage space of the second terminal, “10” is used to indicate that the number of effective bytes of the storage path of the file one.txt stored in the storage space of the second terminal is 10, namely, a 10-byte ASCII code after “10” indicates the storage path of the file, “00 2E 2F 6F 6E 65 2E 74 78 74” indicates that the file storage path is ./one.txt, where the file name is “one.txt”, and “0D 0A” is a suffix of the first instruction, and indicates that the first instruction is ended. 
     A format of the second instruction that carries a storage path ./two.txt of a file name two.txt is 00 01 02 03 02 A6 11 10 00 2E 2F 74 77 6F 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the second instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the file is used to carry the information of the storage space of the second terminal, “10” is used to indicate that the number of effective bytes of the file storage path of the file two.txt stored in the storage space of the second terminal is 10, namely, a 10-byte ASCII code after “10” indicates the storage path of the file, “00 2E 2F 74 77 6F 2E 74 78 74” indicates that the file storage path is ./two.txt, where the file name is “two.txt”, and “0D 0A” is a suffix of the second instruction, and indicates that the second instruction is ended. 
     When the storage space of the second terminal further stores a folder shm, and the folder shm has a file one.txt, the first instruction response message further includes a third instruction, and a format of the third instruction is as follows: 
     The format of the third instruction carrying a file name of one.txt in the folder shm is 00 01 02 03 02 A6 11 12 00 73 68 6D 2F 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the third instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the file is used to carry the information of the storage space of the second terminal, “12” is used to indicate that the number of effective bytes of the information of the storage space of the second terminal is 12, namely, a 12-byte ASCII code after “12” indicates the folder and content in the folder, “00 73 68 6D 2F 6F 6E 65 2E 74 78 74” indicates a path shm/one.txt, and “0D 0A” is a suffix of the third instruction, and indicates that the third instruction is ended. 
       103 : The first terminal sets a virtual folder in the storage space of the first terminal, and stores, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. 
     The first terminal maps, by setting a virtual folder, the information of the storage space of the second terminal to the virtual folder, so that the storage space of the second terminal is completely visible to the first terminal; when the user operates the virtual folder, operations such as duplication and copy of a file may be supported as the storage space of the first terminal is operated. The storage space may be an SD (Secure Digital Memory Card, secure digital memory card) or another memory card of a terminal. 
     In the method for expanding a storage space provided by the embodiment of the present invention, a first terminal sends a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal; and after receiving a first instruction response message sent by the second terminal, sets a virtual folder in a storage space of the first terminal, and stores, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     Correspondingly, the embodiment of the present invention further provides a method for expanding a storage space, and as shown in  FIG. 2 , the method includes the following steps: 
       201 : Obtain information of a storage space of a second terminal when the second terminal receives a first instruction message sent by a first terminal, where the first instruction message carries an instruction of obtaining the information of the storage space of the second terminal. 
     A manner of message transmission between the first terminal and the second terminal is not limited here, and may also be WiFi or other manners besides bluetooth. Description is given by taking that the first terminal and the second terminal establish a bluetooth connection as an example. After the first terminal and the second terminal establish the bluetooth connection, the second terminal receives, through bluetooth, the first instruction message sent by the first terminal. As long as it is ensured that a defined first instruction message can be distinguished from a general bluetooth transmission file, a format of the first instruction message may be defined randomly, and the first instruction message is parsable to the first terminal and the second terminal. For example, the first instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt, which indicates that the first terminal performs a relevant operation on the storage space of the second terminal. The second terminal determines, by parsing a received file, what specific operation it is. 
     The instruction in the first instruction message may be indicated by using hexadecimal, and a format is 00 01 02 03 02 A6 10 0D 0A, where “00 01 02 03 02 A6” is a prefix of the first instruction message, “10” indicates an instruction of obtaining storage content in the storage space of the second terminal, and “0D 0A” is a suffix of the first instruction message, and indicates that the instruction message is ended. 
       202 : The second terminal sends a first instruction response message to the first terminal, where the first instruction response message carries the information of the storage space of the second terminal. 
     As long as it is ensured that a defined first instruction response message can be distinguished from a general bluetooth transmission file, a format of the first instruction response message may be defined randomly, and the first instruction response message is parsable to the first terminal and the second terminal. For example, the first instruction response message is encapsulated in a form of .txt file for transmission. 
     The second terminal carries the obtained file name in the first instruction response message, and sends the first instruction response message to the first terminal. For example, a file name of the first instruction response message is also handset B to handset A.txt, and is used to be distinguished from general bluetooth transmission data. The instruction in the first instruction response message may be indicated by using hexadecimal. When the storage space of the second terminal stores two files, whose file names are one.txt and two.txt respectively, the first instruction response message includes two instructions, and formats of the two instructions are respectively shown in the following: 
     A format of a first instruction carrying a file name of one.txt is 00 01 02 03 02 A6 11 08 00 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the first instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the first instruction message carries the information of the storage space of the second terminal, “08” is used to indicate that the number of effective bytes of the file name of the file one.txt stored in the storage space of the second terminal is 8, namely, an 8-byte ASCII code after “08” indicates the file name of the file, “00 6F 6E 65 2E 74 78 74” indicates that the file name is “one.txt”, and “0D 0A” is a suffix of the first instruction, and indicates that the first instruction is ended. 
     A format of a second instruction carrying a file name of two.txt is 00 01 02 03 02 A6 11 08 00 74 77 6F 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the second instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the file is used to carry the information of the storage space of the second terminal, “08” is used to indicate that the number of effective bytes of the file name of the file two.txt stored in the storage space of the second terminal is 8, namely, an 8-byte ASCII code after “08” indicates the file name of the file, “00 74 77 6F 2E 74 78 74” indicates that the file name is “two.txt”, and “0D 0A” is a suffix of the second instruction, and indicates that the second instruction is ended. 
     For the foregoing one.txt and two.txt, the first instruction response message may also carry storage paths of the two files, such as ./one.txt, and ./two.txt, which indicate that these two files are stored under a root directory of the storage space of the second terminal. 
     When the storage space of the second terminal further stores a folder shm, and the folder shm has a file one.txt, the first instruction response message further includes a third instruction, and a format of the third instruction is as follows: 
     The format of the third instruction carrying a file name of one.txt in the folder shm is 00 01 02 03 02 A6 11 12 00 73 68 6D 2F 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the third instruction, “11” indicates a key word corresponding to the first instruction message, and is used to indicate that the file is used to carry the information of the storage space of the second terminal, “12” is used to indicate that the number of effective bytes of the information of the storage space of the second terminal is 12, namely, a 12-byte ASCII code after “12” indicates the folder and content in the folder, “00 73 68 6D 2F 6F 6E 65 2E 74 78 74” indicates a path shm/one.txt, and “0D 0A” is a suffix of the third instruction, and indicates that the third instruction is ended. 
     By sending the information in the storage space of the second terminal to the first terminal, the storage space of the second terminal is mapped to the virtual folder of the first terminal, so that the storage space of the second terminal is completely visible to the first terminal; when a user operates the virtual folder, operations such as duplication and copy of a file may be supported as the storage space of the first terminal is operated. The storage space may be an SD (Secure Digital Memory Card) or another memory card of a terminal. 
     In the method for expanding a storage space provided by the embodiment of the present invention, when receiving a first instruction message sent by a first terminal, a second terminal obtains information of a storage space of the second terminal, and sends the information of the storage space of the second terminal to the first terminal through a first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     In a first implementation manner of the embodiment of the present invention, a method for expanding a storage space is provided. As shown in  FIG. 3 , after the first terminal maps the information in the storage space of the second terminal to the virtual folder, taking bluetooth transmission as an example, the method further includes the following steps. 
       301 : The first terminal sends a second instruction message to the second terminal when receiving an operation that a user stores a first designated file in the virtual folder of the first terminal, where the second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file. 
     For example, if the user does not intend to occupy the storage space of the first terminal, but intends to store the first designated file in the virtual folder, the first terminal receives the operation that the user stores the first designated file in the virtual folder of the first terminal, and then the first terminal sends the second instruction message to the second terminal through bluetooth. 
     As long as it is ensured that a defined second instruction message can be distinguished from a general bluetooth transmission file, a format of the second instruction message may be defined randomly, and the second instruction message is parsable to the first terminal and the second terminal. For example, the second instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt, which indicates that the first terminal performs a relevant operation on the storage space of the second terminal. The second terminal determines, by parsing a received file, what specific operation it is. For example, when a file with a file name of shm.txt is stored in a folder shm in a SD card of the second terminal, the format of the second instruction message is shown in the following: 
     00 01 02 03 02 A6 12 20 18 73 64 63 61 72 64 2F 73 68 6D 2F 73 68 6D 2E 74 78 74 22 04 00 00 04 00 0D 0A, where “00 01 02 03 02 A6” is a prefix of the second instruction message, “12” indicates a key word corresponding to the second instruction message, and is used to indicate that the file is to notify the second terminal to store, according to the designated storage path, the file in the storage space of the second terminal, and determine, according to the size of the carried to-be-stored file, whether a residual storage space of the second terminal can store the first designated file, “20” indicates a key word corresponding to the designated storage path, and is used to indicate the storage path of the first designated file, “18” indicates that the number of effective bytes of the carried designated storage path is 18, namely, the following “73 64 63 61 72 64 2F 73 68 6D 2F 73 68 6D 2E 74 78 74” indicates that the designated storage path is sdcard/shm/shm.txt, “22” indicates a key word corresponding to the size of the first designated file, and is used to indicate the size of the first designated file, “04” indicates that the number of effective bytes of the size of the carried first designated file is 4, namely, the following “00 00 04 00” indicates the size of the first designated file with a unit of kByte, where “04 00” indicates that the size of the first designated file is 1 kByte, and “0D 0A” is a suffix of the second instruction message, and indicates that the instruction message is ended. 
       302 : When the second terminal receives the second instruction message sent by the first terminal, the second terminal determines whether a size of the residual storage space of the second terminal is less than the size of the to-be-stored first designated file, where the second instruction message carries the instruction of storing a file in the storage space of the second terminal, the designated storage path and the size of the first designated file. 
     The second terminal acquires, by parsing the second instruction message, that the second terminal is to store the first designated file in the storage space of the second terminal, where the second instruction message carries the size of the first designated file, so that it is convenient for the second terminal to determine whether the residual storage space can store the first designated file. 
       303 : The second terminal sends a confirmation instruction to the first terminal when the size of the residual storage space of the second terminal is not less than the size of the first designated file, where the confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. 
     When the size of the residual storage space of the second terminal is greater than or equal to the size of the first designated file, it indicates that the storage space of the second terminal is capable of storing the first designated file, and the second terminal sends a confirmation instruction to the first terminal. The confirmation instruction is only a general bluetooth confirmation instruction that the to-be-transmitted file can be received, which may be implemented by utilizing the prior art. 
       304 : The first terminal sends the first designated file to the second terminal when the first terminal receives the confirmation instruction sent by the second terminal, where the confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. 
     The confirmation instruction is only a general bluetooth confirmation instruction that the to-be-transmitted file can be received, which may be implemented by utilizing the prior art. 
       305 : The second terminal receives the first designated file sent by the first terminal, and stores the first designated file in the storage space of the second terminal according to the designated storage path. 
       306 : The second terminal sends a second instruction response message to the first terminal, where the second instruction response message carries an instruction that file storage is successful. 
     After storing the first designated file in the storage space according to the designated storage path, the second terminal sends the second instruction response message to the first terminal. As long as it is ensured that a defined second instruction response message can be distinguished from a general bluetooth transmission file, a format of the second instruction response message may be defined randomly, and the second instruction response message is parsable to the first terminal and the second terminal. For example, the second instruction response message is encapsulated in a form of .txt file for transmission. A file name is still handset B to handset A.txt, so that it is convenient for the first terminal to distinguish the second instruction response message and other ordinary bluetooth transmission files. The format of the second instruction response message is shown in the following: 
     00 01 02 03 02 A6 13 0D 0A, where “00 01 02 03 02 A6” is a prefix of the second instruction response message, “13” indicates a key word corresponding to the second instruction response message, and is used to indicate that the file is to notify the first terminal that the second terminal has already successfully stored the first designated file in the storage space, and “0D 0A” is a suffix of the second instruction response message, and indicates that the response message is ended. 
       307 : The first terminal stores a file name of the first designated file in the virtual folder of the first terminal according to the designated storage path when the first terminal receives the second instruction response message sent by the second terminal, where the second instruction response message carries an instruction that file storage is successful. 
     When the first terminal receives, through bluetooth, the second instruction response message whose file name is still handset B to handset A.txt and which is sent by the second terminal, it indicates that what is sent by the second terminal is a response message of an operation performed by the first terminal on the storage space of the second terminal, which indicates that the first designated file has already been successfully stored in the storage space of the second terminal. 
     In order that the virtual folder is kept consistent with the storage space of the second terminal, the file name of the first designated file is stored in the virtual folder according to the designated storage path, so that it is convenient for the user to check in future. 
     As shown in  FIG. 4 , the implementation manner of  FIG. 3  further includes the following steps: 
       308 : The second terminal sends an error instruction to the first terminal when the size of the residual storage space of the second terminal is less than the size of the first designated file, where the error instruction indicates that the residual storage space of the second terminal is less than the size of the first designated file. 
     The error instruction is only a general bluetooth error instruction, which indicates that the to-be-transmitted file cannot be received, and may be implemented by utilizing the prior art. 
       309 : When the first terminal receives the error instruction sent by the second terminal, the first terminal prompts that the first designated file cannot be stored in the virtual folder, where the error instruction indicates that the residual storage space of the second terminal is less than the size of the first designated file. 
     After receiving the error instruction, the first terminal does not send the to-be-stored first designated file to the second terminal anymore. 
     In a second implementation manner of the embodiment of the present invention, a method for expanding a storage space is provided. As shown in  FIG. 5 , after the first terminal maps the information in the storage space of the second terminal to the virtual folder, taking bluetooth transmission as an example, the method further includes the following steps: 
       501 : The first terminal sends a third instruction message to the second terminal when receiving an operation that a user invokes a second designated file in the virtual folder of the first terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. 
     When the user intends to read or edit the second designated file in the virtual folder of the first terminal, the second designated file is invoked from the virtual folder, and the first terminal sends the third instruction message to the second terminal. 
     As long as it is ensured that a defined third instruction message can be distinguished from a general bluetooth transmission file, a format of the third instruction message may be defined randomly, and the third instruction message is parsable to the first terminal and the second terminal. For example, the third instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt, which indicates that the first terminal performs a relevant operation on the storage space of the second terminal, and the second terminal obtains specific operation content by parsing received file content. When the user is to invoke a file one.txt in a folder shm in a SD of the second terminal, the third instruction message may be indicated by utilizing hexadecimal, and the format is shown in the following: 
     00 01 02 03 02 A6 14 18 73 64 63 61 72 64 2F 73 68 6D 2F 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the third instruction message, “14” indicates a key word corresponding to the third instruction message, and is used to indicate that the first terminal is to invoke the second designated file in the storage space of the second terminal, “18” is used to indicate that the number of effective bytes of the invocation path for invoking the second designated file is 18, an 18-byte ASCII code after “18” indicates the invocation path, “73 64 63 61 72 64 2F 73 68 6D 2F 6F 6E 65 2E 74 78 74” indicates the invocation path sdcard/shm/one.txt, where the last one.txt is the file name of the second designated file, and “0D 0A” is a suffix of the third instruction message, and indicates that the instruction message is ended. 
       502 : The second terminal receives the third instruction message sent by the first terminal, where the third instruction message carries the instruction of invoking a file from the storage space of the second terminal and the invocation path of the second designated file, and the invocation path of the second designated file includes the file name of the second designated file. 
       503 : The second terminal searches, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. 
     When receiving the third instruction message, the second terminal obtains, by parsing the third instruction message, the invocation path sdcard/shm/one.txt of the second designated file with the file name of “one.txt” to be invoked by the first terminal, and searches, in the storage space, for the file with the file name of “one.txt” according to the invocation path. 
       504 : When finding, through searching, a file with a file name the same as the file name of the second designated file, the second terminal duplicates the second designated file, to obtain a duplicate of the second designated file. 
       505 : The second terminal sends a third instruction response message and the duplicate of the second designated file to the first terminal, where the third instruction response message carries an instruction that file invocation is successful. 
     When the second designated file with the file name of one.txt is found through searching, the second designated file is duplicated to obtain a duplicate of the file, and the duplicate is sent to the first terminal through bluetooth. Additionally, the second designated file still exists in the storage space of the second terminal, so that it is convenient for the user to invoke later. 
     The second terminal further sends the third instruction response message to the first terminal. As long as it is ensured that a defined third instruction response message can be distinguished from a general bluetooth transmission file, a format of the third instruction response message may be defined randomly, and the third instruction response message is parsable to the first terminal and the second terminal. For example, the third instruction response message is encapsulated in a form of .txt file for transmission, and the file format is shown in the following: 
     00 01 02 03 02 A6 15 ff 0D 0A, where “00 01 02 03 02 A6” is a prefix of the third instruction response message, “15” indicates a key word corresponding to the third instruction response message, “ff” indicates that file invocation is successful, and “0D 0A” is a suffix of the third instruction response message, and indicates that the response message is ended. 
       506 : The first terminal receives the third instruction response message and the duplicate of the second designated file that are sent by the second terminal, where the third instruction response message carries the instruction that file invocation is successful. 
       507 : The first terminal stores the duplicate of the second designated file in the storage space of the first terminal, so that the user performs a read/write operation on the duplicate of the second designated file. 
     When receiving the third instruction response message and the duplicate of the second designated file through bluetooth, the first terminal stores the duplicate of the second designated file in the storage space of the first terminal, and the user may read or edit the duplicate of the second designated file in the storage space of the first terminal. Additionally, the file name of the second designated file still exists in the virtual folder of the first terminal. 
     In a third implementation manner of the embodiment of the present invention, a method for expanding a storage space is provided. As shown in  FIG. 6 , after the first terminal maps the information in the storage space of the second terminal to the virtual folder, taking bluetooth transmission as an example, the method further includes the following steps: 
       601 : The first terminal sends a fourth instruction message to the second terminal when receiving an operation that a user deletes a third designated file in the virtual folder of the first terminal, where the fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. 
     When the user intends to delete a file in the virtual folder, for example, intends to delete a file one.txt in a folder shm in a SD card, the first terminal sends the fourth instruction message to the second terminal when the first terminal receives a deletion operation of the user. As long as it is ensured that a defined fourth instruction message can be distinguished from a general bluetooth transmission file, a format of the fourth instruction message may be defined randomly, and the fourth instruction message is parsable to the first terminal and the second terminal. For example, the fourth instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt. The second terminal obtains specific operation content by parsing the received fourth instruction message. The fourth instruction message is indicated by utilizing hexadecimal, and the format is shown in the following: 
     00 01 02 03 02 A6 16 18 73 64 63 61 72 64 2F 73 68 6D 2F 6F 6E 65 2E 74 78 74 0D 0A, where “00 01 02 03 02 A6” is a prefix of the fourth instruction message, “16” indicates a key word corresponding to the fourth instruction message, and is used to indicate that the first terminal is to delete the third designated file in the storage space of the second terminal, “18” is used to indicate that the number of effective bytes of the deletion path of the third designated file is 18, an 18-byte ASCII code after “18” indicates the file name of the file, “73 64 63 61 72 64 2F 73 68 6D 2F 6F 6E 65 2E 74 78 74” indicates that the deletion path of the third designated file is sdcard/shm/one.txt, where the last one.txt is the file name of the third designated file, and “0D 0A” is a suffix of the fourth instruction message, and indicates that the instruction message is ended. 
       602 : The second terminal receives the fourth instruction message sent by the first terminal, where the fourth instruction message carries the instruction of deleting a third designated file in the storage space of the second terminal and the deletion path of the third designated file, and the deletion path of the third designated file includes the file name of the third designated file. 
       603 : The second terminal searches, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. 
     When receiving the fourth instruction message through bluetooth, the second terminal obtains, by parsing the fourth instruction message, that the first terminal is to delete the file one.txt in the folder shm in the SD card of the second terminal, and the second terminal searches, in the storage space, for the file with the file name of one.txt according to the deletion path sdcard/shm/one.txt. 
       604 : When finding, through searching, a file with a file name the same as the file name of the third designated file, the second terminal deletes the file, and sends a fourth instruction response message to the first terminal, where the fourth instruction response message carries an instruction that file deletion is successful. 
     When finding, through searching, the third designated file with the file name of one.txt, the second terminal deletes the third designated file from the storage space of the second terminal, and sends the fourth instruction response message to the first terminal through bluetooth. As long as it is ensured that a defined fourth instruction response message can be distinguished from a general bluetooth transmission file, a format of the fourth instruction response message may be defined randomly, and the fourth instruction response message is parsable to the first terminal and the second terminal. For example, the fourth instruction response message is encapsulated in a form of .txt file for transmission. The file format is shown in the following: 
     00 01 02 03 02 A6 17 ff 0D 0A, where “00 01 02 03 02 A6” is a prefix of the fourth instruction response message, “17” indicates a key word corresponding to the fourth instruction response message, “ff” indicates that file deletion is successful, and “0D 0A” is a suffix of the fourth instruction response message, and indicates that the response message is ended. 
       605 : The first terminal deletes the file name of the third designated file from the virtual folder according to the deletion path when the first terminal receives the fourth instruction response message sent by the second terminal, where the second instruction response message carries the instruction that file deletion is successful. 
     When the first terminal receives, through bluetooth, the fourth instruction response message carrying that file deletion is successful and sent by the second terminal, the first terminal deletes, in the virtual folder, the file name of the third designated file according to the deletion path, so that content stored in the storage space of the second terminal is consistent with content in the virtual folder. 
     In a fourth implementation manner of the embodiment of the present invention, a method for expanding a storage space is provided. As shown in  FIG. 7 , after the first terminal maps the information in the storage space of the second terminal to the virtual folder, taking bluetooth transmission as an example, the method further includes the following steps: 
       701 : The first terminal sends a fifth instruction message to the second terminal when receiving an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal, where the fifth instruction message carries an instruction of querying a residual storage space of the second terminal. 
     When the user intends to query the size of the residual storage space of the virtual folder, namely, query a size of the residual storage space of the second terminal, the first terminal sends the fifth instruction message to the second terminal when the first terminal receives a querying operation of the user. As long as it is ensured that a defined fifth instruction message can be distinguished from a general bluetooth transmission file, a format of the fifth instruction message may be defined randomly, and the fifth instruction message is parsable to the first terminal and the second terminal. For example, the fifth instruction message is encapsulated in a form of .txt file for transmission, and a file name is handset B to handset A.txt. The second terminal obtains specific operation content by parsing the received fifth instruction message. The fifth instruction message may be indicated by utilizing hexadecimal, and the format is shown in the following: 
     00 01 02 03 02 A6 18 0D 0A, where “00 01 02 03 02 A6” is a prefix of the fifth instruction message, “18” indicates a key word corresponding to the fifth instruction message, and is used to indicate that the first terminal is to query the size of the residual storage space of the second terminal, and “0D 0A” is a suffix of the fifth instruction message, and indicates that the instruction message is ended. 
       702 : The second terminal queries the size of the residual storage space of the second terminal when the second terminal receives the fifth instruction message sent by the first terminal, where the fifth instruction message carries the instruction of querying a residual storage space of the second terminal. 
       703 : The second terminal sends a fifth instruction response message to the first terminal, where the fifth instruction response message carries the size of the residual storage space of the second terminal. 
     When receiving, through bluetooth, the fifth instruction message carrying a query for the residual storage space of the second terminal, the second terminal queries the size of the residual storage space, and sends the size to the first terminal through bluetooth. As long as it is ensured that a defined fifth instruction response message can be distinguished from a general bluetooth transmission file, a format of the sent fifth instruction response message may be defined randomly, and the fifth instruction response message is parsable to the first terminal and the second terminal. For example, the fifth instruction response message is encapsulated in a form of .txt file for transmission, and the file format is shown in the following: 
     00 01 02 03 02 A6 19 04 00 00 04 00 0D 0A, where “00 01 02 03 02 A6” is a prefix of the fifth instruction response message, “19” indicates a key word corresponding to the fifth instruction response message, “04” is used to indicate that the number of effective bytes of the size of the residual storage space of the second terminal is 4, namely, “00 00 04 00” after “04” indicates the size of the residual storage space of the second terminal, whose unit is kByte, where “04 00” indicates that the size of the residual storage space of the second terminal is 1 kByte, and “0D 0A” is a suffix of the fifth instruction response message, and indicates that the response message is ended. 
       704 : The first terminal receives the fifth instruction response message sent by the second terminal, where the fifth instruction response message carries the size of the residual storage space of the second terminal. 
       705 : The first terminal displays the size of the residual storage space of the virtual folder, where the size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     The first terminal receives, through bluetooth, the fifth instruction response message carrying the size of the residual storage space of the second terminal. The received size of the residual storage space of the second terminal is the size of the residual storage space of the virtual folder, and the size of the residual storage space of the virtual folder is displayed. 
     In the foregoing embodiment, a storage space of a second terminal is used as a virtual folder of a first terminal, which is similar to a drive of the first terminal, thereby expanding the storage space of the first terminal, the storage space of the second terminal is completely visible to the first terminal, and the first terminal may operate the storage space of the second terminal like operating the storage space of the first terminal itself. 
     Embodiment 2 
     The embodiment of the present invention provides an apparatus  80  for expanding a storage space. As shown in  FIG. 8 , the apparatus  80  includes a sending unit  81 , a receiving unit  82 , and a processing unit  83 . 
     The sending unit  81  is configured to send a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal. 
     The receiving unit  82  is configured to, after the sending unit sends the first instruction message to the second terminal, receive a first instruction response message sent by the second terminal, where the first instruction response message carries the information of the storage space of the second terminal. 
     The processing unit  83  is configured to set a virtual folder in a storage space of a first terminal, and store, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message received by the receiving unit. 
     In the apparatus for expanding a storage space provided by the embodiment of the present invention, a first terminal sends a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal; and after receiving a first instruction response message sent by the second terminal, sets a virtual folder in a storage space of the first terminal, and stores, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     Optionally, the sending unit is further configured to, when the receiving unit receives an operation that a user stores a first designated file in the virtual folder of the first terminal, send a second instruction message to the second terminal, where the second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file; and when the receiving unit receives a confirmation instruction sent by the second terminal, send the first designated file to the second terminal, where the confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file; and 
     the processing unit is further configured to, when the receiving unit receives a second instruction response message sent by the second terminal, store a file name of the first designated file in the virtual folder of the first terminal according to the designated storage path, where the second instruction response message carries an instruction that file storage is successful. 
     Optionally, as shown in  FIG. 9 , the apparatus further includes a prompting unit  84  configured to prompt that the first designated file cannot be stored in the virtual folder when the receiving unit receives an error instruction sent by the second terminal. The error instruction indicates that a residual storage space of the second terminal is less than the size of the first designated file. 
     Optionally, the sending unit is further configured to, when the receiving unit receives an operation that a user invokes a second designated file in the virtual folder of the first terminal, send a third instruction message to the second terminal. The third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The receiving unit is further configured to receive a third instruction response message and a duplicate of the second designated file that are sent by the second terminal, where the third instruction response message carries an instruction that file invocation is successful. The processing unit is further configured to store, in the storage space of the first terminal, the duplicate which is of the second designated file and is received by the receiving unit, so that the user performs a read/write operation on the duplicate of the second designated file. 
     Optionally, the sending unit is further configured to, when the receiving unit receives an operation that a user deletes a third designated file in the virtual folder of the first terminal, send a fourth instruction message to the second terminal. The fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. 
     The processing unit is further configured to, when the receiving unit receives a fourth instruction response message sent by the second terminal, delete the file name of the third designated file from the virtual folder according to the deletion path, where the second instruction response message carries an instruction that file deletion is successful. 
     Optionally, the sending unit is further configured to, when the receiving unit receives an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal, send a fifth instruction message to the second terminal. The fifth instruction message carries an instruction of querying a residual storage space of the second terminal. 
     The receiving unit is further configured to receive a fifth instruction response message sent by the second terminal, where the fifth instruction response message carries a size of the residual storage space of the second terminal. 
     The prompting unit is further configured to display the size of the residual storage space of the virtual folder according to the fifth instruction response message received by the receiving unit, where the size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     The apparatus  80  is disposed in a client of the first terminal, or the apparatus is a client of the first terminal. 
     Correspondingly, the embodiment of the present invention further provides an apparatus  10  for expanding a storage space. As shown in  FIG. 10 , the apparatus  10  includes a receiving unit  11 , an obtaining unit  12  and a sending unit  13 . 
     The receiving unit  11  is configured to receive a first instruction message sent by a first terminal, where the first instruction message carries an instruction of obtaining information of a storage space of a second terminal. 
     The obtaining unit  12  is configured to, when the receiving unit receives the first instruction message sent by the first terminal, obtain the information of the storage space of the second terminal. 
     The sending unit  13  is configured to send a first instruction response message to the first terminal according to the information of the storage space of the second terminal obtained by the obtaining unit, where the first instruction response message carries the information of the storage space of the second terminal. 
     In the apparatus for expanding a storage space provided by the embodiment of the present invention, when receiving a first instruction message sent by a first terminal, a second terminal obtains information of a storage space of the second terminal, and sends the information of the storage space of the second terminal to the first terminal through a first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     Optionally, as shown in  FIG. 11 , the apparatus further includes a processing unit  14  configured to determine whether a size of a residual storage space of the second terminal is less than a size of a to-be-stored first designated file when the receiving unit receives a second instruction message sent by the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and the size of the first designated file. 
     The sending unit is further configured to send a confirmation instruction to the first terminal when the processing unit obtains that the size of the residual storage space of the second terminal is not less than the size of the first designated file. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. A storage unit  15  is configured to store, according to the designated storage path, in the storage space of the second terminal, the first designated file sent by the first terminal and received by the receiving unit. 
     The sending unit is further configured to send a second instruction response message to the first terminal, where the second instruction response message carries an instruction that file storage is successful. 
     Optionally, the sending unit is further configured to, when the processing unit obtains that the size of the residual storage space of the second terminal is less than the size of the first designated file, send an error instruction to the first terminal, where the error instruction indicates that the residual storage space of the second terminal is less than the size of the first designated file. 
     Optionally, as shown in  FIG. 12 , the receiving unit is further configured to receive a third instruction message sent by the first terminal, where the third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of a second designated file, and the invocation path of the second designated file includes a file name of the second designated file. 
     The apparatus further includes a searching unit  16 , configured to search, by using the file name which is of the second designated file and is received by the receiving unit, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. 
     The processing unit is further configured to, when the searching unit finds, through searching, a file with a file name the same as the file name of the second designated file, duplicate the second designated file, to obtain a duplicate of the second designated file. 
     The sending unit is further configured to send a third instruction response message and the duplicate of the second designated file to the first terminal. The third instruction response message carries an instruction that file invocation is successful. 
     Optionally, the receiving unit is further configured to receive a fourth instruction message sent by the first terminal. The fourth instruction message carries an instruction of deleting a third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. 
     The searching unit is further configured to, when the receiving unit receives the fourth instruction message, search, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. 
     The processing unit is further configured to, when the searching unit finds, through searching, a file with a file name the same as the file name of the third designated file, delete the file, and send a fourth instruction response message to the first terminal by using the sending unit, where the fourth instruction response message carries an instruction that file deletion is successful. 
     Optionally, as shown in  FIG. 13 , the apparatus  10  further includes: a querying unit  17 , configured to, when the receiving unit receives a fifth instruction message sent by the first terminal, query a size of a residual storage space of the second terminal, where the fifth instruction message carries an instruction of querying the residual storage space of the second terminal. 
     The sending unit is further configured to send, according to a result obtained, through querying, by the querying unit, a fifth instruction response message to the first terminal, where the fifth instruction response message carries the size of the residual storage space of the second terminal. 
     The apparatus  10  is disposed in a client of the second terminal, or the apparatus is a client of the second terminal. 
     For operation procedures of the apparatus  80  and the apparatus  10 , reference is made to the foregoing processing procedure in the method for expanding a storage space. 
     Embodiment 3 
     The embodiment of the present invention provides an apparatus for expanding a storage space. As shown in  FIG. 14 , an apparatus  140  includes a memory  1401 , a wireless communication module  1402  and a processor  1403 . 
     The memory  1401  is configured to store a software program and data. 
     The wireless communication module  1402  is configured to receive/send an instruction message and a file, and particularly send an instruction message or a file sent by a second terminal to the processor  1403  for processing; and additionally, send an instruction message processed by the processor  1403  to the second terminal. 
     Generally, the wireless communication module includes, but is not limited to, a bluetooth module and a WiFi module. 
     The processor  1403  is configured to execute the software program in the memory  1401 , and specifically execute sending a first instruction message to the second terminal. The first instruction message carries an instruction of obtaining information of a storage space of the second terminal. The processor  1403  is configured to specifically execute the step of receiving a first instruction response message sent by the second terminal. The first instruction response message carries the information of the storage space of the second terminal. The processor  1403  is configured to specifically execute the step of setting a virtual folder in a memory of a first terminal, and storing, in the virtual folder. The information of the storage space of the second terminal is carried in the first instruction response message. 
     In the apparatus for expanding a storage space provided by the embodiment of the present invention, a first terminal sends a first instruction message to a second terminal, where the first instruction message carries an instruction of obtaining information of a storage space of the second terminal; and after receiving a first instruction response message sent by the second terminal, sets a virtual folder in a storage space of the first terminal, and stores, in the virtual folder, the information of the storage space of the second terminal carried in the first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     Optionally, the processor  1403  is further configured to execute sending a second instruction message to the second terminal when receiving an operation that a user stores a first designated file in the virtual folder of the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and a size of the to-be-stored first designated file. The processor  1403  is further configured to specifically execute the step of sending the first designated file to the second terminal when receiving a confirmation instruction sent by the second terminal. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. 
     The processor  1403  is further configured to specifically execute the step of storing a file name of the first designated file in the virtual folder of the first terminal according to the designated storage path when receiving a second instruction response message sent by the second terminal. The second instruction response message carries an instruction that file storage is successful. 
     Optionally, as shown in  FIG. 15 , the apparatus  140  further includes a display  1404 . 
     The processor  1403  is further configured to execute prompting that the first designated file cannot be stored in the virtual folder when receiving an error instruction sent by the second terminal. The error instruction indicates that a residual storage space of the second terminal is less than the size of the first designated file. 
     The display  1404  prompts that the first designated file cannot be stored in the virtual folder. 
     Optionally, in the apparatus  140 , the processor  1403  is further configured to execute sending a third instruction message to the second terminal when receiving an operation that a user invokes a second designated file in the virtual folder of the first terminal. The third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The processor  1403  is further configured to execute the step of receiving a third instruction response message and a duplicate of the second designated file that are sent by the second terminal. The third instruction response message carries an instruction that file invocation is successful. 
     The processor  1403  is further configured to execute the step of storing the duplicate of the second designated file in the storage space of the first terminal, so that the user performs a read/write operation on the duplicate of the second designated file. 
     Optionally, in the apparatus  140 , the processor  1403  is further configured to execute sending a fourth instruction message to the second terminal when receiving an operation that a user deletes a third designated file in the virtual folder of the first terminal. The fourth instruction message carries an instruction of deleting the third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. 
     The processor  1403  is further configured to execute the step of deleting the file name of the third designated file from the virtual folder according to the deletion path when receiving a fourth instruction response message sent by the second terminal, where the fourth instruction response message carries an instruction that file deletion is successful. 
     Optionally, in the apparatus  140 , the processor  1403  is further configured to execute sending a fifth instruction message to the second terminal when receiving an operation that a user queries a size of a residual storage space of the virtual folder of the first terminal, where the fifth instruction message carries an instruction of querying a residual storage space of the second terminal. The processor  1403  is further configured to execute the step of receiving a fifth instruction response message sent by the second terminal. The fifth instruction response message carries a size of the residual storage space of the second terminal. The processor  1403  is further configured to execute the step of displaying the size of the residual storage space of the virtual folder, where the size of the residual storage space of the virtual folder is equal to the size of the residual storage space of the second terminal. 
     The apparatus  140  is disposed in a client of the first terminal, or the apparatus is a client of the first terminal. 
     Correspondingly, as shown in  FIG. 16 , the embodiment of the present invention provides an apparatus  160  for expanding a storage space, where the apparatus  160  includes a memory  1601 , a wireless communication module  1602  and a processor  1603 . 
     The memory  1601  is configured to store a software program and data. 
     The wireless communication module  1602  is configured to receive/send an instruction message and a file, and particularly send an instruction message or a file sent by a first terminal to the processor  1603  for processing; and additionally, send an instruction message processed by the processor  1603  to the first terminal. 
     Generally, the wireless communication module includes, but is not limited to, a bluetooth module and a WiFi module. 
     The processor  1603  is configured to execute the software program in the memory  1601 , and specifically execute obtaining information of a storage space of a second terminal when receiving a first instruction message sent by the first terminal. The first instruction message carries an instruction of obtaining the information of the storage space of the second terminal. The processor  1403  is further configured to execute the step of sending a first instruction response message to the first terminal. The first instruction response message carries the information of the storage space of the second terminal. 
     In the apparatus for expanding a storage space provided by the embodiment of the present invention, when receiving a first instruction message sent by a first terminal, a second terminal obtains information of a storage space of the second terminal, and sends the information of the storage space of the second terminal to the first terminal through a first instruction response message. In the embodiment of the present invention, it is implemented that, under a precondition of not increasing a storage space of a first terminal, a storage space of a second terminal is used as a virtual disk of the first terminal, thereby increasing the storage space of the first terminal. 
     Optionally, in the apparatus  160 , the processor  1603  is further configured to execute determining whether a size of a residual storage space of the second terminal is less than a size of a to-be-stored first designated file when receiving a second instruction message sent by the first terminal. The second instruction message carries an instruction of storing a file in the storage space of the second terminal, a designated storage path and the size of the first designated file. The processor  1603  is further configured to execute the step of sending a confirmation instruction to the first terminal when the size of the residual storage space of the second terminal is not less than the size of the first designated file. The confirmation instruction indicates that the storage space of the second terminal is capable of storing the first designated file. The processor  1603  is further configured to execute receiving the first designated file sent by the first terminal, and storing the first designated file in the storage space of the second terminal according to the designated storage path. The processor  1603  is further configured to execute sending a second instruction response message to the first terminal, where the second instruction response message carries an instruction that file storage is successful. 
     Optionally, in the apparatus  160 , the processor  1603  is further configured to execute sending, by the second terminal, an error instruction to the first terminal when a size of a residual storage space of the memory  1601  is less than the size of the first designated file, where the error instruction indicates that the residual storage space of the memory  1601  is less than the size of the first designated file. 
     Optionally, in the apparatus  160 , the processor  1603  is further configured to execute receiving a third instruction message sent by the first terminal. The third instruction message carries an instruction of invoking a file from the storage space of the second terminal and an invocation path of the second designated file, and the invocation path of the second designated file includes a file name of the second designated file. The processor  1603  is further configured to execute searching, in the storage space, for a file with a file name the same as the file name of the second designated file according to the invocation path. The processor  1603  is further configured to execute when finding, through searching, a file with a file name the same as the file name of the second designated file, duplicating the second designated file, to obtain a duplicate of the second designated file. The processor  1603  is further configured to execute sending a third instruction response message and the duplicate of the second designated file to the first terminal. The third instruction response message carries an instruction that file invocation is successful. 
     Optionally, in the apparatus  160 , the processor  1603  is further configured to execute receiving a fourth instruction message sent by the first terminal. The fourth instruction message carries an instruction of deleting a third designated file in the storage space of the second terminal and a deletion path of the third designated file, and the deletion path of the third designated file includes a file name of the third designated file. The processor  1603  is further configured to execute searching, in the storage space, for a file with a file name the same as the file name of the third designated file according to the deletion path. The processor  1603  is further configured to execute when finding, through searching, a file with a file name the same as the file name of the third designated file, deleting the file, and sending a fourth instruction response message to the first terminal. The fourth instruction response message carries an instruction that file deletion is successful. 
     Optionally, in the apparatus  160 , the processor  1603  is further configured to execute querying a size of a residual storage space of the memory  1601  when receiving a fifth instruction message sent by the first terminal. The fifth instruction message carries an instruction of querying the residual storage space of the memory  1601 . The processor  1603  is further configured to execute sending a fifth instruction response message to the first terminal, where the fifth instruction response message carries the size of the residual storage space of the memory  1601 . 
     The apparatus  160  is disposed in a client of the second terminal, or the apparatus is a client of the second terminal. 
     For operation procedures of the apparatus  140  and the apparatus  160 , reference is made to the foregoing processing procedure in the method for expanding a storage space. 
     Through the foregoing description of the implementation manners, persons skilled in the art may be clearly understand that the present invention may be accomplished in a manner of software plus necessary universal hardware, and certainly, may also be accomplished by hardware, but in most cases, the former is a preferred implementation manner. Based on such understanding, the technical solutions of the present invention or the part that makes contributions to the prior art may be substantially embodied in a form of a software product. The computer software product is stored in a readable storage medium, for example, a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions used to enable a computer device (which may be a personal computer, a server, or a network device, or the like) to perform the methods according to the embodiments of the present invention. 
     The foregoing description is merely specific implementation manners of the present invention, but is not intended to limit the protection scope of the present invention. Variations and replacements made by persons skilled in the art within the protection scope disclosed in the present invention shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the appended claims.