A method for prompting a signal coverage area, comprising: when detecting a signal coverage area searching instruction from a user (S1,S2), a mobile terminal performing a positioning operation, acquiring current location information of the mobile terminal, and according to signal strength around the current location of the mobile terminal, determining a list of blind areas around the current location; and the mobile terminal prompting the user to open a map, and displaying the current location of the mobile terminal on the map, and displaying signal coverage areas near the current location according to the list of blind areas; characterized by, the mobile terminal detecting received wireless signal strength, when the received wireless signal strength hops from a value less than or equal to a preset blind area signal strength threshold value to a value greater than the preset blind area signal strength threshold value, the mobile terminal performing the positioning operation again to acquire current location information of the mobile terminal; if no record for location information identical or approximately identical with the current location information of the mobile terminal exists in the list of blind areas, the mobile terminal taking the current location information of the mobile terminal as location information of a new blind area boundary point to be stored into the list of blind areas; wherein, the approximately identical location information refers to: a distance between locations corresponding to two pieces of location information being less than or equal to a blind area distance differential threshold value; when the mobile terminal detects that the received wireless signal strength is greater than the preset blind area signal strength threshold value, and a distance between the current location corresponding to the current location information of the mobile terminal and location(s) of one or more blind area boundary points recorded in the list of blind areas is less than or equal to a preset blind area distance differential threshold value, the mobile terminal deleting a record for a blind area boundary point with a distance to the current location of the mobile terminal that is less than or equal to a preset blind area distance threshold value from the list of blind areas. when detecting a signal coverage area searching instruction from a user (S1,S2), a mobile terminal performing a positioning operation, acquiring current location information of the mobile terminal, and according to signal strength around the current location of the mobile terminal, determining a list of blind areas around the current location; and the mobile terminal prompting the user to open a map, and displaying the current location of the mobile terminal on the map, and displaying signal coverage areas near the current location according to the list of blind areas; characterized by, the mobile terminal detecting received wireless signal strength, when the received wireless signal strength hops from a value less than or equal to a preset blind area signal strength threshold value to a value greater than the preset blind area signal strength threshold value, the mobile terminal performing the positioning operation again to acquire current location information of the mobile terminal; if no record for location information identical or approximately identical with the current location information of the mobile terminal exists in the list of blind areas, the mobile terminal taking the current location information of the mobile terminal as location information of a new blind area boundary point to be stored into the list of blind areas; wherein, the approximately identical location information refers to: a distance between locations corresponding to two pieces of location information being less than or equal to a blind area distance differential threshold value; when the mobile terminal detects that the received wireless signal strength is greater than the preset blind area signal strength threshold value, and a distance between the current location corresponding to the current location information of the mobile terminal and location(s) of one or more blind area boundary points recorded in the list of blind areas is less than or equal to a preset blind area distance differential threshold value, the mobile terminal deleting a record for a blind area boundary point with a distance to the current location of the mobile terminal that is less than or equal to a preset blind area distance threshold value from the list of blind areas.